The issues I've noticed are around desktop applications. For example if I select some text in KWrite (KDE's "Notepad") by using SHIFT+CTRL+LEFT_ARROW then it will select the word. If I do the equivalent in Notes (macOS) it will select the whole line, not just the word (I tested this just now too).
This platform specific behavioural differences isn't something that's unique when comparing to KWrite vs Notes, I just picked those applications as an example. It also isn't just SHIFT+CTRL+LEFT_ARROW that differs. There's a quite a few subtle differences when using the keyboard to navigate around text areas. None of them significant but they're always enough to break my concentration when trying to get stuff done.
A lot of these can be redefined. Both on Linux and on macOS though. So you can absolutely make the two platforms behave the same way, given enough time and motivation. So we are just talking about defaults here.
Is this something that needs to be enabled? Or is it dependant on something else to work? It's definitely a feature I'd welcome.
[edit] A friend checked on his Montery machine and said they work as expected in system text boxes.
Use option instead of control here.
