alt Hacker NewsVisibility isn't the problem. As OP mentioned, you can go into Activity Monitor to easily see what application is doing this. The user just doesn't seem to have any control over it or any way to stop a particular application from doing it.
Replies
It's buried too deep. Clicking on battery and seeing a line saying "There are apps preventing sleep >" and hovering on it to see a list is way better than digging activity monitor.
Another option might be another section for apps preventing sleep, like power hungry applications.
MacOS has a "apps using significant battery" thing that is quite useful. I think here there's a similar argument for an in your face thing.
That way when the battery goes from 60% to 30% you get told about it, instead of when you go from 30% to 5% and then have other problems as well.
Not so certain about the actual knowability here though
I find something, presumably a Safari tab, blocking sleep regularly and not actually showing up in activity monitor.
Why is this not an opt-in thing? Heck, why can’t I turn it off? I can could the number of tabs that I want to allow to function when “sleeping” on zero fingers.