Most LACs ask for one rec. from a math/science teacher, one from a humanities teacher, and one from a GC. Some of the large public schools D applied to asked for only one teacher rec. or only a GC rec. and one didn’t want any supplementary materials at all.
One thing I think some kids don’t pay enough attention to is the writing ability of the recommender. A teacher can be a kid’s biggest fan in the world, but if they can’t express on paper what makes that kid special the recommendation isn’t going to be very valuable. OTOH I’ve seen talented writers write letters for mediocre students that would make me want to admit that kid on the spot.