"....the textbooks always suggest..."
Oh, those textbooks! No worthwhile symphonies between Beethoven and Brahms (well, Schumann, but then he was hardly at his best in large forms, the poor dear, and bless us that orchestration...) Then there were the five Romantic piano concertos: the two Brahms', Schumann (see caveats above), Grieg (sniff) and Tschaikovsky 1 (two sniffs) Rachmaninoff? Oh please! And Chopin? Di-vine piano writing, (but see all the caveats regarding Schumann.)
Yes, without textbooks, this forum would have no reason to exist. And think of all the wonderful exploring the members would be missing!
David