This makes it really, really awful if you're playing a recital and slip up just a tiny bit (obviously, you should practice it so you don't slip up /at all/, but let's be realistic here. Even people studying to be performance majors make mistakes in their recitals) - your first instinct would be to start the passage over, which is the /last/ thing you want to be doing.
It also makes it nearly impossible to play with a group.