> they don't follow platform guidelines
I don't think platform guidelines that anyone listens to have been a real thing for a long time. Even between apps released by MS there is little or no consistency at times, things that should be part of standard OS provided chrome like title-bars are a random mess - good luck guessing what has input focus sometimes, particularly with multiple monitors, as you unlock or switch vdesktop, without clicking to make sure.
I keep thinking of writing something that detects the top-most app window and draws an obvious box around it.
Native macOS developers respected Apple's Human Interface Guidelines for a long time, but even that's declining now that everyone needs to work around all the problems with Liquid Glass.
>> I keep thinking of writing something that detects the top-most app window and draws an obvious box around it.
I would use this in a heartbeat. With Windows 10/11 I usually have the option to apply a garish accent color to the active window active. Nowadays, more and more apps don't use native window frames anymore, so that option works less and less.
The W11 task bar with its barely legible indicators doesn't help either.
On a big ultra-wide display with a few windows open, I sometimes struggle to see which one is active.