In shopping for books of tactical problems on the net lately, I've noticed a lot of people complain about problem books that have a heavy focus on puzzles that require checkmate, rather than winning a piece/pawn.

Can some of you better (than me, I'm a beginner) players comment on whether this is a legit complaint? From my patzer point of view, I would've thought that the ideas inherent in a checkmate problem apply equally to winning a piece

After all, isn't the idea to identify a piece that is weak/unprotected, and play a series of forcing moves that allow you to capture it, whether it be a knight or a king?