AFAIK this is only a part of it, it still has its opening library, as well as the end-game one (IIRC chess is a solved game for up to seven remaining pieces on

AFAIK this is only a part of it, it still has its opening library, as well as the end-game one (IIRC chess is a solved game for up to seven remaining pieces on the board). Also, the PR you link says the removed code in fact had a performance impact, just too low to justify its code size 25% of all Stockfish).