Besides being polite I don’t see a reason for likes. What would be the effects of eliminating likes and follower count? You could still follow someone but it doesn’t need to show a count anywhere. No more likes or followers. Just put out whatever content you want and receive zaps from people that find value.
Discussion
Likes / follower count can be signals that allow algos to pick the best messages out of an ocean of infinite noise. Of course likes and followers, being free, can be gamed, so zaps would be better.