I guess I should start.
I like the 460cc drivers, they're easy and fun to hit, but if it is shown to be an important part of an equipment rollback for the good of the game, I'm willing to give it up (still think the ball is more to blame, but there it is).
I like the fancy conditioning, but if it makes golf more sustainable, I'm willing to go back to something more basic, even at expensive courses.
There is probably more, but I'm really curious what others think of as essential vs. nice to have.