This is an occasional problem I've had on multiple platforms (Android/Windows OS, browser UI, ZoneAlarm way back when, etc). Why is it not yet a thing to ignore

This is an occasional problem I've had on multiple platforms (Android/Windows OS, browser UI, ZoneAlarm way back when, etc). Why is it not yet a thing to ignore the first click within 50-100ms or so of a dialog popping up? Especially on desktop where you can find out if the cursor was already in place before the pop-up showed.