I supposed you could look at it thay way. Or you could say that there are four discrete buttons. Vol+, Vol-, R2Vol+, R2Vol-, and that they should work as such in all cases. Even my wife notices that it's a hassle.

Sometimes I stand in between my two rooms (main and R2), and try to adjust volumes to be relatively the same. I don't care for the delay before I can adjust the main room after adjusting R2.