But it gets worse. If you have only 1 window with some app open (browser, terminal..), and this window has two tabs inside, clicking on the taskbar icon representing this window won't bring the window up. It will first bring up these small previews above the taskbar for every tab that you then have to click again (pick any) and then finally you get the window brought up. This is horrible because when you have tabs side by side in the window (terminal example), it doesn't matter which tab you choose as the same window pops up showing both tabs anyway. However you have to click twice (or hover for a bit to get the previews and then click again).
Congratulations to "Windows" version where switching "windows" is painful.
FWIW, I'm a Microsoft employee (not in Windows org) and I complain about "never combine" in any feedback forms we get. Maybe it will make a difference somewhere. (opinions are my own)