I'm not here to toss insults your way or call you whiners. I don't think you are, at least for the most part.
Look.....what the hell were they suppose to do? I understand that everyone has their own preference on how they want the Mass Effect franchise to continue. Lord knows I'll be praying to the gods that this new game will be the start of a new trilogy. But I'm also a realist in the sense that they definitely wrote themselves into a wall, thanks to how Mass Effect 3 ended, and no matter what they did it was gonna upset off a part of the fanbase.
If they made a prequel, they'd upset people who didn't want a prequel and wanted the series to move forward.
If they made a sequel and canonized an ending, they'd upset the people who didn't choose that ending.
If they tried to combine all three endings it would've been a mess
If they tried to handwave the ending by setting the game hundreds if not thousands of years into the future, they'd still have to address the endings in some form. These were galactic, culturally impacting choices. You cannot handwave that, and if you do, then players are gonna complain that they did.
Their best option was to bring the series to another galaxy. It's true we won't get to see the Citadel, Omega, or any of the familiar places of Mass Effect again. But in it's place we'll have a brand new setting to explore and fall in love with. Remember despite how primitive the gameplay was in Mass Effect 1, we enjoyed it because we were being introduced to a universe and lore that we would eventually fall in love with?
Don't you remember this:
Do you want to recapture that feeling again?
We will be exploring unknown territories, new races, new cultures, lore, technology, etc. If you're upset that we won't see the Milky Way again, I understand. But I encourage you to give Andromeda a chance here. It was the best option for the writers to take in a bad situation. And it opens up so many possibilities. If I haven't convinced you yet, then all I can say is at least wait until we get more info on the game.