Your lack of faith in BioWare's writing because of your own narrow perception of what can be "dealt with via save editor or vague writing" is a disservice to BioWare and nothing more.
Why would I have faith in BioWare's writing? I didn't like the writing in ME3 or ME2 very much and Inquisition and DA2 were lackluster at best.
Do you honestly believe BioWare did not plan ahead and understand how these endings would impact the future of the franchise?
I
know they didn't plan beyond the ending. They didn't even know how ME3 was going to end until they were already halfway into making the game. The ending was designed by 2 people to require the least amount of work, not a writing team with a vision.
I know many just assume BioWare just "wrote themselves into a wall." That, however, is one of the dumbest and most ridiculous statements I have ever heard.
They cannot continue in the Milky Way without ignoring our choices or picking a canon galaxy-state that ignores our choices. Your advocacy for vague writing that ignores out choices shows that you don't have a leg to stand on in a discussion about writing.
We still don't know how far into the future the next Mass Effect. We don't know where it is taking place, regardless of this "leak." Again, only 1% of the Milky Way had been explored. There is so much we don't know that it's incredibly outrageous and shortsighted to say what BioWare can't do. You are not a member of the writing team. You are not an authority on Mass Effect nor where it will go in the future. Like the rest of us, all you know is what we experienced in the games and nothing more. You can continue believing BioWare "screwed up," if you'd like. However, I believe you may find yourself disappointed, especially if previous choices actually do have an impact on the story going forward through some sort of Mass Effect Keep.
If you have so much faith in BioWare's writing why are you saying they shouldn't do what they may want to do? You're saying they
have to continue in the Milky Way just because. Why don't you have faith in the writer's ability to craft a good story outside of the Milky Way.