I'm reworking on blend tracks right now and I think it's really great to put that in place. There, you have to stop the sound, uncheck, reset the sound, re-check ...
And in addition there are bugs: When you launch a blend track and release a sound, you no longer stop it because the sound is unchecked ...
There are also a lot of bugs with the Pitches and the volume when you sweep the RTPC, you often have to stop the sound and restart it ...