I dunno about rounded corners for beauty - but there are cases when I find them function over form.
Recent HN discussion about the wyze cam app - it was pointed out to me that a feature I had never been able to find (and only put in a less than half-assed attempts to find tbh) - was via a HUGE green button on X screen.
Seeing as though I have used this app many many times over the past year plus, I went looking for it - and wham - it is actually there.
But.. it's a large sharp cornered bottom of the screen - which made it look like a header / footer / name of page to me.. it never dawned on me that it was a 'button' - if it had rounded corners and a drop shadow it would have be obvious to me.
Of course I had other expectations as well - that the 'thing to push' would be above the half way fold of the screen to access such an important function - and that the naming conventions would be done better - but I digress.
Now I did like the 'beauty' of slightly rounded corners back in the day when everything was sharp, and many web pages had 'sidebars' - I liked the look of a round corner there.
Sadly most content is absorbed via the mobile devices and such 'form' is not as much about beauty / style as it is to show function these days it seems.
Small data points, but another perspective that may not have been considered nonetheless.