[dkonofalski]

>100% of the show for every show

You're mis-framing what I'm saying. The effect is the same. There is something on the display that is unwanted. Regardless of what that thing is, the issue at hand is that people do not want things that they didn't choose to be on the display to actually be on the display. It doesn't matter what that is. In this case, it's a small dot but it could have been a little microphone icon or a camera icon or (like Windows) an orange border around the display or literally anything else.

The fact that it didn't affect some people before is great. They were lucky that they didn't have this happen. All I'm saying is that, for years before this change in Monterey, there have been things that pop-up like this on external displays because external displays do not have the ability to prevent the OS from using a display as a display (with a couple exceptions when used with APIs for exclusivity). That's a known problem with using extended displays and it's been known for a while, regardless of the OS you're using. There's also a solution to that problem that's pretty standard in the presentation/production industry.

That being said... there are now multiple solutions for people that both don't break the intention behind this change (they're slightly technical solutions that most people won't do) and allow for app developers themselves to fix the problem (using the APIs already provided to get screen exclusivity).