Yeah I have 32k saves and hit the same problems with search being extremely unreliable. About 5 years ago quotes stopped working in search. Trying to find "The Grapes of Wrath" would return all instances of "of" and "the." You could sort of hack it by searching for the most distinct word (maybe "Grapes") if you already knew exactly what you were searching for. I long suspected there was some architectural change they made on the backend that broke this and they didn't want to admit in support articles. Perhaps the Mozilla legal department determined that having a text copy of all articles in their database was some legal risk and they moved to just having the URL and maybe the title (this would also explain why "permanent copies" disappeared).

Anyway, as the 32k articles indicate, I was a power user of Pocket so part of me is sad it's going away. But they've really been checked out since maybe 2019 with regards to any real support for this product.