There appear to be two kinds of teams:
1. Sure, you can switch back to classic mode for now. But warning: we're just gonna take away that option in a few weeks, so you might as well just give in right away.
2. Our new rewrite is very similar in UI but much faster, and better in almost every way. We're keeping it semi-secret until it's better in actually every way. If you ask nicely, you can join the limited dogfood.