For high & mid-wing a/c, dihedral is a performance limiter (in the sense of aerobatic capability) & once a beginner has mastered basic flying skills, dihedral in those a/c types is of no benefit -- removal is desirable.

In low wing a/c, a small amount of dihedral is actually necessary, & removal of dihedral (unless it is excessive) reduces aerobatic capability.

Control authority in models is so powerfull that stability is not usually a real issue for rc pilots once they are past the beginner stages.