First, having companions does not make stealth ineffective and how you got that from my posts is beyond me (take Ghost Recon:Future Soldier, stealth sequences in Spec Ops:The Line, Conflict:Vietnam and Desert Storm). Second, all that solo experience discussion comes from your post that in all Bioware games it's you with two squadmates killing hordes of enemies. I then gave you examples of that not having to be the case one of which you dismissed as belonging to a different franchise and another as being DLC. I never argued that ME:Next should be a solo game, rather that going solo is not unheard of in at least three Bioware games two of which belong to ME franchise.
Liara's face is an example of why DLCs can't be dismissed when talking about next game. Whether it's visuals or gameplay mechanics (like her powers) DLCs feature content in ME universe that fans like and it gets in the next game. Noticed the party in DA:I? Now tell me it wasn't influenced by Citadel DLC. I'm, for example, pretty sure that we'll get class-specific interrupts and environmental hazards in ME:Next - tested in Omega DLC and multiplayer.
You tell me that I'm misusing the term "stealth" and then proceed to tell that I want something that I never said. Environments are being worked on unless you assume that all the levels are built already. Explosions and decoys to throw the enemy of my trail is not something I want, creating those to have the enemies investigate and clear a path is different. It can even be a scripted event for all its worth.
Silencer is a tool meant for (duh) taking out targets silently. Having it in the game does not make it a stealth game, as you said, but it does give you the opportunity to kill targets without others noticing.
Do I need to quote myself again? Where did you get that I want Batman or Altair experience in Mass Effect?
I may come out as hostile because you keep skipping over my posts, twist their meaning and constantly claim that Bioware won't do it with the ultimate authority you don't have. You're entitled to your opinion but don't try to force it on the others.
Ghost Recon has always been a tactical, stealth game. Many of the Tom Clancy titles, most notable Splinter Cell, thrive off that particular gameplay experience. BioWare never has with any of their games. You gave me an example of a five minute event out of 80+ hours of content and a add-on providing a few hours of content versus 150+ hours of content from the base games. You are using rare and special circumstances to somehow justify that the likelihood of a solo mechanic is feasible for the base game. This is just not true. As I said before, going all the way back to Baldur's Gate, BioWare games are party-based. Yes, there are occasions when you might be "alone," but they are few and far between and have never been the entire experience of any BioWare game. If the solo experience was really that crucial to BioWare, do you really think they would waste the money and resources on voice actors for companions?
"Liara's face is an example of why DLCs can't be dismissed when talking about next game." I don't know about you, but that statement alone sounds absolutely ridiculous. You are really going to make the argument that because of using a different model for Liara, that then supports the idea that a stealth mechanic, that you are asking for, that has never been in ME, or any of the DLC, will just miraculously appear in NME? That doesn't make any sense at all.
I wouldn't assume anything. Again, this isn't "Mass Effect 4," and BioWare has made this point clear quite a few times. You should not expect everything from the previous games to make an appearance in the next Mass Effect, especially if it was a minor or obscure feature. It is very likely that many aspects from previous games will be missing entirely as NME goes new directions. For one, NME is being developed by Montreal and not Edmonton, who made the Citadel DLC with your "stealth" mechanic. Secondly, all Montreal has talked about is exploration, Mako, and the main protagonist having something to do with N7, meaning he/she is likely military and a soldier.
World building and environments happen early in development. I wouldn't be surprised if most, if not all of the environments of the next Mass Effect are complete at this point. Later stages of development focus on voice acting, main story and side quest content, soundtrack, etc. Again, you are asking for an overhaul of the AI mechanics in directions no BioWare game has ever gone. I see this being very unlikely as you are looking for a predator system similar to Batman, Skyrim, Dishonored, etc.
The silencer is the only practical feature you have mentioned that I could see being in the next Mass Effect. BioWare doesn't have to completely revamp their entire combat system to implement it, as they would with what you are asking for. I don't believe you understand how much work would have to go in to the game to get what you want to be a reality.
You want enemies to investigate, you want different paths in order to do silent takedowns, you want to remain hidden and completely avoid or remove every enemy without being detected. What you want is Batman: Arkham/Assassin's Creed.
I'm not forcing anything on you. On the contrary, it could possibly happen. I'm just merely saying it's very unlikely given how much it would impact the entire experience. Mass Effect, again, is a tactical party-based, third person shooter. Using cover and killing enemies directly is the experience and always has been for BioWare. The experience you want has no precedent nor foundation in any of the games. You use poor examples or minor interactions as being evidence, but they far from make any assertion of what you are hoping will be a large feature in the next Mass Effect.
I understand you want a stealth experience. You are clearly quite biased towards having it and that is apparent by your words as well as your signature. It's also why you are hostile towards anyone with a differing opinion. I get it. I'm just trying to be realistic and explain to you that Mass Effect has never been the game you want it to be. I wouldn't put the unreasonable expectation on BioWare to make that stealth experience. You'll only let yourself down.