[crazygringo]

The lack of per-application volume is annoying I agree, as a consumer.

But I don't think that's a feature requested by audio professionals. They're working within applications, not playing audio from multiple apps at the same time. And it would be extremely annoying to discover that your DAW output volume had accidentally somehow been set to 90% and you hadn't realized it. I mean, mixing is done with visual decibel meters, but a lot still depends on little details that are above or below the threshold of hearing, which an application-level volume control would mess with.

[naikrovek]

I’m pretty sure MacOS could easily have a built-in master audio mixer and a setting on that mixer labeled “bypass”, which gives the current MacOS behavior of “no master audio mixer.”

I can’t believe that only a few people have ever asked for a way to mute an app entirely.

I grow weary of excuses around the lack of a built-in feature for this. “Apple doesn’t want to do it” is the only reason.