Casual users do care about app behaving wrong, though.
If you can't copy or paste things, or if the navigation is backwards, or if the calendar looks weird etc etc - it all causes some minor frustrations, when things don't behave as user wants them to behave.
They don't know what "native" means, obviously - they don't have that knowledge. They just know crappy apps from well-behaving apps, because they have a frame of reference (vendor-supplied native apps).
Is there a concrete example of this? I still only hear this on HN where some mythical user gets annoyed about copying and pasting (most apps don't allow that, even, like TikTok or Instagram, which are the apps where most users spend the most time). Like the sibling commenter, I only have seen whether the app does what they want or it doesn't, most don't notice any annoyances unless they're really looking for them, which they're not.
> I still only hear this on HN where some mythical user gets annoyed about copying and pasting
Perhaps they're not complaining because they've just accepted that it probably doesn't work and so don't even try anymore.
My SO has stopped trying to copy/pasting stuff, I now always just get screenshots, both from mobile and her PC.
At work, almost none of the customers I interact with copy/paste stuff, they send screenshots as well. Like, "can you send me the order number?" will result in a screenshot of the order number control, or often just the whole order window.