because we have volume on the whole machine, laptop or phone.
A volume slider on a video player is a really basic feature that every one should have.
Maybe you and TeMPOraL do.
Not to mention, maybe a long-running process will use some audio cue as a notification while you're listening.
(Actually, given the rest of the comment, I'm pretty sure TeMPOraL was being sarcastic.)
Most things these days, good or bad, are not designed for power users.
Ironically many here I'm sure are running MacOS.
> all audio content ever has its loudness perfectly normalized to a global standard everyone adheres to.