Well, I'm not so sure that a recorded acoustic piano, which has implicit effects due to microphone placement, and most surely EQ and compression added at some point in at least the mastering stage, could be distinguished from a softsynth (either a many-GB set of samples or even a modeling technique).
It's been a long time since I've personally used this tech, but I'm almost 100% sure that a great many performances you'll hear on disc, at least in a band context with a good bit of "exposed" acoustic piano parts, are done in studio with modeled or sampled pianos.
Editing MIDI tracks? Sure, not much different than splicing with tape or with a digital track. It's not my idea of a fun way to spend an afternoon/evening, using a mouse or directly entering values via a keyboard.
The values the MIDI standard can encode are limited, granted, but I'm not sure it's a deal-breaker when considering the mixed and mastered final recording.
With all those parameters accounted for and recognized, I'm not so sure there's a big difference from recording and editing with tape in the studio.
What probably is of most interest is that most serious musicians these days have some cheap access to studio tools.
So, who knows?
The short of my concern is that once an acoustic piano is mic'ed, recorded, mixed, and mastered, you already have significant processing of the recording. Just the mechanics of splicing or altering performances is a bit more user-friendly than taking a blade to tape and performing splices that way.