>>175685238>If only 40 of those 620 you really enjoyed, you would still have a hard time naming all 40 of the top of your head.
Sure. But when would I actually need to name those 40 anime? The most people ask for at once is a top-9 (3x3; and that's a 4chan specific meme). Usually, naming your few absolute favourites suffices in most contexts, and you won't forget those.
Also, if you asked me about books I've enjoyed (for example), of course I couldn't think of all of those on the fly. Even if you gave me an hour or two to compile them into a list, I'd probably forget about half of them, like, don't know, the Ancient Greek stuff I've read. But if we were talking about classical tragedies, I'd sure as hell jump to Antigone or Medea or Oedipos Tyrannos within a second. It's the same for anime.
If a certain topic comes up, you won't have to consult a list to know whether you've seen something or not, even if it was only one item in a few hundred.
Not saying that you can't keep such a list, just that there's no reasonable point in doing so.