I’d add that some of the older texts are really badly laid out - often handwritten or in a strange typeface that makes them really hard to mentally parse when you‘re used to the uniformity of modern scores.
That said imslp is still a life-saver and playing music would be a lot more painful (and expensive!) without it
That said imslp is still a life-saver and playing music would be a lot more painful (and expensive!) without it