I'm still in the weeds with what makes an iPad "pro" or not.
Besides the USB C port, which would make "pro" workflows easier if they include an external harddrive.
All the other "features" the differentiate the 3 lines iPad - iPad Air - iPad Pro don't make or break the "usefulness", they're just like luxury car add ons. Fancy glass, fancy cameras, fancy bezel, but overall, all iPad apps appear to have great performance on all models of iPad and I assume that's by design. Sure an iPhone app won't run as well on an iPhone 6S, but it will on an iPhone 8 which is pretty much what the regular iPad is.