That's exactly what I said >__> You wanting them to admit it when its already obvious is just for petty self satisfaction. Them going to Andromeda is enough of a confession.
ANd what reason do I have to believe they won't do the same ting to Andromeda. Because clearly they didn't make a mistake before 
When Mass Effect was just a brand new IP with no identity they had to build it up from nothing. ME became about characters from all walks of life with their own customs, habits, and traits trying to survive together in a galactic community. It was about finding out how fragile all of our places in the universe truly are, and trying to become much bigger than ourselves to stop a great threat. It had characters who were all unique from each other. It had exotic alien technology. Every main character you met with had their own stories, their own turmoils and challenges to overcome. Are you seriously telling me all of these things occured because it took place in the MWG? No, they happened because it took place in a universe Bioware created. You simply cannot argue what Mass Effect has meant to a lot of people. There would be no backlash to the ME3 ending that has persisted to this day if the Mass Effect series didn't mean anything. It once meant nothing to people, and grew up to mean a lot to people. There's no reason to think they can't do it again, and not allowing them to doesn't do anyone justice.
If you didn't like any of that to begin with then how the F did you ever become a fan of ME? Sounds like it was never your cup of tea to begin with.
And now that galactic community is no more. It died in a RGB explosion.
Our place in the universe was destroyed by a galactic threat, forcing us to become intergalactic vagabonds.
Those characters? Gone. All gone. The tech? also largely gone. No more Citadel. No more mass relays (the very symbol of the series)
Sure there are great characters and interesting stories. But you know what? That's not unique to Mass Effect. Simply stamping an N7 logo on a character and saying "Mako!" doesn't make a game Mass Effect. If Blizzard were to make another scifi game, will that automatically be a Starcraft game?
Sure Mass Effect once meant something. Sadly, now it seems to mean "keep trying to get golden eggs out of that goose we killed"
What is so hard to understand about that? If the next game took place in unexplored sections of the MWG it would make no difference than if they just put it into Andromeda, except they get to escape the endings. It'd still be a foreign region of space we've never visited before. We're still going to see old races like the Krogan. Nothing is lost or gained because it takes place in the unexplored Andromeda rather than unexplored regions of the MWG. It's going to feel foreign regardless of the name of the galaxy it takes place it.
If we visit a cluster where we're surrounded by violet and blue colors on the galaxy map, as well as fictional planets that don't actually exist, it makes no difference whether its in the MWG or not, it's going to look the same regardless. You could take any of the designs of the MWG clusters from the original trilogy that we visited and slap their design onto Andromeda and there would be no difference.
It wasn't the MWG that made the series interesting, it was what was in it. Planets like Omega, characters like Aria. Whose to say Andromeda isn't going to be filled with its own memorable location and characters? They weren't interesting because they took place in the MWG.
It's going to feel like a giant @$$pull because there is no lore-friendly reason why we should be there. Or even if, by some miracle, it is possible, why we shouldn't be fighting the Reapers all over again. Heck I made an entire thread on this topic alone.
If it was still in the Milky Way, we'd still have the relay network (an unexplored network) to visit distant stars, to go beyond known borders. Visit strange new worlds, and all that.
The galaxy map isn't just pretty colors, it's a picture. A mosaic we could never hope to fill in our lifetimes, and now never will. Omega and other places it connected to are lost to us forever. the best we can hope for would be a "Totally Not Omega" Expy.