[yobin]

I can, as a "UX" Designer (Or whatever we are called nowadays) attest to that users do not care about the native look or feel.

The most important thing for a user is how pleasing it looks, not even how easy it is to use.

https://en.wikipedia.org/wiki/Aesthetic%E2%80%93usability_ef...

The reason that icon sets are similar is probably because they are quite ingrained into our memory. The save icon, although younger people have no idea what it's supposed to represent, is evident to them to be the save function. And since icons are generally meant to guide the user, then you opt to use something they already know. After all they do not have much agency compared to the main content of an app or site.