That's true, but I don't know why everything should be a zap. To me, a zap is only for something of note, high value, etc ... The likes, boosts, laughs, whatever else are for low to medium value. If nostr were zaps only, then the boosts, responses, replies, and all interactions would drop through the floor.

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Most Nostr clients only show likes (as in the heart) and for me there really is no difference between a like and low-value zap. How does a zap of 21 sats signal anything different than a like? So to avoid duplication you'd need to either get rid of low-value zaps (put up a min threshold) or get rid of likes. And getting rid of likes feels cleaner.