i think very few people would opt for the memorizing hertz frequencies route as opposed to just abandoning Yamaha and calling middle c C4, so i figure you gotta have some penchant for memorizing
there was the feeling of wanting to have proper names for the notes in an absolute sense which doesn't need the letter at all. for example, if you took the letter away from the C4 C5 system, you'd have 4s for the entire octave, etc . .. it's nice to have an independent number system for really just saying how high something is. more for sonic reasons