I *personally* think fighting the AoE meta is a road not worth taking. The playerbase has always defined what makes this game fun. I do *not* want to take away anyone's fun. I have a bunch of ideas on the whiteboard. I don't speak for everyone, so I really can't answer any of your questions with any real definitive statement. I can talk about my design ideas, though.
When I began concepting things and learning mission design, I had the thought of "How do I subvert the meta of running headlong into everything carelessly, and get the players to just pause to think about what's in front of them, if for only a second?" This thought basically was molded into "Well, it wouldn't be fun all the time and would upset the status quo, but it would be fun to have obstacles spaced out that reminds the player to stop and look around." I might do this by removing a door in a map that you've grown used to, or spreading out a spawn for strategic placement, or by having ambushes in unexpected places. But I also want to have new enemy types with new kinds of utility.
In that regard. we have the time and the tech to do things the live team could not within their release timeframes. But we all have our own obstacles as well.
TL;DR: I'm here to enhance your gameplay through diversity.