Yes, I replaced mine after about a year. I had a paper feel screen
protector fitted, and it was certainly more abrasive on the pencil tip. I
even tried the rubber tip covers, but they often only lasted a few weeks at
best.
I’ve gone back to a plain glass screen protector now, and it’s not showing
any wear at all now, even the rubber tip lasts ages (months). I still use
those, as I prefer the feel on the glass surface, they offer a little more
resistance.
I did buy the genuine Apple tips though, I wouldn’t trust third party ones
on my iPad Pro screen (even with a protector fitted). To be honest, I
didn’t think a pack of four tips was that badly priced, and only a little
more than the cheaper options.
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Andy H