Why can't I always remember the piano score?

I think it's because you are not proficient. I think I started by memorizing some technical requirements, such as getting stronger, weakening and slowing down. If I compose music, I will naturally know how to play it if the music is ripe. It's easy to remember it on this basis. Sometimes people are lazy, and when they are ripe, they will unconsciously follow it, so they don't think about composing music at all, but they have to force themselves to remember it. It's like in their minds. But I think familiarity is really a prerequisite. If you can't even recite the most, it means that your hand, brain and score are not enough. Of course, if you don't recite enough, you have to remember the score clearly, so I think it's more appropriate to recite it first and then memorize it.