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I implore that zoomers go and actually play rby.
You're approaching moveset design after years of power-creep conditioned your expectations.
I was like this, I had the exact same questions, but when I actually played it I found that in the actual environment of gen 1 MOST learnsets make sense in terms of balance for the single-player.
Are there problems? Yes, multiple moves just actively serve no purpose or are bugged out of their purpose, but it's rare for that to ruin a 'mon. Hell, I think Scyther is the best example of a 'mon that gets hurt by bugged moves, but even it gets to be useful in practice.