MacOS is, in my experience, incredibly clunky due to this mismatch. You can fix some (e.g. use AltTab for sane alttabbing), but not others (how can i prevent the next application window popping up when minimizing one)
I think this paradim is also what's makes the Mac OS feel snappy. If basically having multiple windows for one software open is "holding it wrong", the OS is pushing you into one application, one window paradigm. As long as you do that, everything is pretty quick. But don't dare open two browser windows, or even worse, two windows of a word processor. The performance will degrade (and you'll keep searching for your windows...)