My reaction when I discovered these shortcuts as a Mac user coming from Plasma was the same as yours, 'what a bizarre, undiscoverable way to do things'.
When macOS finally got a flexible screen capturing app (now bound to Cmd+Shift+5) Mac users were rightly very pleased. But we'd had that as the default, highly discoverable behavior on Plasma for more than a decade, and the equivalent on Windows was already old news, too.
Maybe it was just hyped too much, and maybe the similarities to Linux just put it in a sort of uncanny valley for me that spoiled what could have been fun. Maybe it was the pressure of trying to learn an OS while onboarding at a new job that stopped me from learning macOS at my own pace that really drove my frustration. But I was left feeling very disappointed by the much fabled UX and design of macOS.
When macOS finally got a flexible screen capturing app (now bound to Cmd+Shift+5) Mac users were rightly very pleased. But we'd had that as the default, highly discoverable behavior on Plasma for more than a decade, and the equivalent on Windows was already old news, too.
Maybe it was just hyped too much, and maybe the similarities to Linux just put it in a sort of uncanny valley for me that spoiled what could have been fun. Maybe it was the pressure of trying to learn an OS while onboarding at a new job that stopped me from learning macOS at my own pace that really drove my frustration. But I was left feeling very disappointed by the much fabled UX and design of macOS.