Previously, when clicking on a plugin inside SV, we could still pause and unpause the DAW’s audio (Studio One, in my case); however, we can no longer do that—it is as if clicking on a plugin inside SV is equivalent to clicking outside the DAW.
They call that kind of thing “keyboard focus”. You’re right that it can be an issue, too, when we can’t stop or start DAW playback with StudioRack open. Last I recalled, though, it would work so long as you didn’t have a plugin window open inside of StudioRack. That’s still annoying enough for it to be a problem.