That is even true for actions I triggered, for example: I click 4 icons on my desktop consecutively and thus 4 binaries start in the background. The order in which they appear is determined by their startup time: One pops up after another. BUT: whenever one is open and I am USING it, all the ones coming up should not pop up over the current one! This bad behaviour even happens in Windows 10 and many desktop environments.

To UI designers: Have some consideration for the f user!