[badlucklottery]

Not OP but the issue for me moving from a scooped keyboard (Kinesis) to a flat one (Ergodox) was reaching the top/bottom row comfortably.

On a flat keyboard, hitting that top row (especially edge keys like the 5 and 6) required either moving my entire hand or doing some weird reaching motion. And I wear a 4XL glove so I don't even know how other people deal with the top row at all. Being able to not move your hands as much doesn't sound like a big thing but it helped a lot with my wrist issues because I can find a comfortable position when I get started and never leave it until I stand up.

I'm currently on a scooped and fully split KB from bastardkb.com which is kind of the best of both worlds (scooped for reach, split for my shoulders, and custom firmware so I can use less keys overall). But if Kinesis offers that out-of-the-box it's a pretty easy choice for my next keyboard.