TulipAcid at a certain point in the learning process, I would erase fingering notations except for something that seemed surprising yet necessary
I never erase fingering or other notes I write (unless I'm changing them). And I would actually recommend that other pianists consider doing this as well, esp if they want to acquire a larger repertoire of play-able pieces and they're not planning on memorizing and maintaining a large set of memorized music.
My reason for this is that I don't memorize music, I always play from the score. If I let a piece fall out of my fingers, I return to the score when I want to bring it back. And over the years I've found that it's an easy process to bring a piece back into my fingers because I have not just a score, but my score, which shows me or reminds me how I played it.
So having all that info (fingerings and other directions) in there, seeing what I had already decided, helps me bring the piece back more quickly. And using the fingering I originally settled on is essential in this process, partly because it re-awakens the muscle memory. If I wasn't playing with the original fingering, I'd have to relearn that. I also suspect that the visual familiarity of the marked score acts as an additional memory trigger in a way that an un-marked up score would not.
I can imagine justifications for erasing fingering, but I think for adult hobby pianists wanting to maintain a larger repertoire, I would advise against it, or at a minimum, recommend trying it and seeing if it helps for long-term repertoire maintenance.
