with rounds you see visible marks almost right away... it takes many many years of full time playing, at least with a hard wood fingerboard, to become an audible problem in my personal experience. But the visible marks are not a problem at all from rounds on a fingerboard.Thanks for the response. I certainly knew it was a thing. I've just never seen photos of what it looks like (although I guess if it's an audible issue, it won't matter too much what it looks like - you'll just know when you play it). There are a few worn fingerboard threads I've found here, but none of the ones I saw showed definitive damage. most were just "is this ok" type threads. Thanks again.
The bass I mentioned this happening on had an ebony fingerboard, unfinished. Not coated. My carvin has a coated board (and came with rounds) and will last forever... it has already lasted many many years with zero issues.
oh, and you're very welcome! I make a big effort to be helpful and accurate, and not presume to think that there is only one way to do things... although there are certainly standard ways, preferred ways, and nonstandard solutions to things.