I know that non-sculpted profiles allow you to switch your keycaps between rows and make your own layout
yes, this is the main reason.
i've used only a couple profiles & materials over the years (cherry, oem, xda, pbt & abs) and have been using blanks for years.
for me, i like thick blank pbt cherry profile, and thick pbt oem isn't horrible either on a small ergo board either.
- i like the stepping of the rows, especially being blank. (i "rest" my fingers between keys, not on home keys)
- i like the feel of pbt over abs (doesn't shine or get "sticky" when abs shines)
- going blank will force you to touch type
uniform profile is usually the only way to get legends correct with whatever odd layout you're using on your ergo board.
though, going for an ergodox, your options are a lot better than most because it is one of the few ergo boards that you can get extra kits made for ergodox in "most?" keycap group buys.
i can't speak to other profiles or GMK sets as i've never had any
good luck on your hunt and welcome to the hobby.