The withering cry of the software engineer "just tune your setup!" This is simply not a thing that people will do.
The defaults are so, so important. They are crucial. The vast majority of people rely on the defaults to be sane. The defaults should be sane.
How much time must everyone be asked to waste to “tune” a working set of applications to something reasonably sane for human beings.
Sure, what is sane for one human might not be for the next, but it’s not as if trends cannot be discerned.
How ridiculous would it be to be told “if you don’t want people constantly barging into your office, lock the door”?
And when I had an office, I closed (not locked) the door to signify I was in a focus mode. I don't get your point.
When I’m focused, I don’t hear it because it’s too subtle. But when I’m not concentrating on anything, it’s more noticeable and I don’t mind the distraction.
This might not work for everyone (“YMMV” and all), but I’ve personally found it a very effective yet simple solution.
I have no audible sounds from notifications. They don't go to my phone, with few exceptions. I get no popups. Yet, I am responsive. It was trivial to set up.