twocats My friend said once you transition to memorized it's a different part of your brain and you can't really go back to the score.
This was my experience.... I would memorize something, maybe play it in a recital or something, and then let it slip from my fingers..... Then, some time later, when I tried to bring it back, it felt like I had to learn it all over again, like I'd never seen it before.
When I have a piece that I polish (and perform) from the score, in which I play it from the score always, if I put it away and come back to it, the time and effort to get it back is so, so much less! So that was what I mean above by saying that not memorizing helps me have a larger playable repertoire.
I suspect the real problem is that, with a piece that was previously memorized and then forgotten, there's probably something I need to do differently to bring it back, and I don't know what that is.
But like you, I'm a good sightreader and it feels so much easier and more efficient to just keep the score....
But it's been a long time since I memorized anything, maybe I have evolved (we can always dream! 😛
The other thing is that probably, with a piece that's been memorized, we maybe could return to the score before putting the piece away and letting it slip from our fingers... Dunno, never tried that!
Anyway, if I pick a vegetable -- I mean score, to memorize, I'll let you know. I guess it depends on how lazy I am! 😃