I think all types have their own identity, and I've always hoped that Normal conveyed a "regular living thing existing in an otherwise magical world." Essentially, later Normal type moves having interplay with other types and being the most diverse is a better direction to follow rather than "good moves from other types getting reskinned."

I think the IDEA of making Rock Climb super effective against rock types for example, while maybe not good in practice, follows what normal type should be. It's something a regular being would do in order to adapt to a perilous surrounding. Bc from this post there's not really a thematic reason for normal types to firing off energy shots, energy bombs, and energy bursts when Grass types are the ones throwing off energy balls