I would maybe argue that responding that way requires a bit more proof of work than a single-button-press thumbs up. It's sort of comparable to just swiping left on every match in tinder. It has really little value.

I do not use it in that way, it feels like you are forcing followers and/or engagement in the cheapest way. If i really like something or see a chance for a witty reaction i will use it. If i found any actual value in it apart from agreement or a chuckle i'll throw in a zap.

In the end it does not matter. This is nostr! If you want to thumbs up the damn thing you hit that button, just like it's somebody else's choice to not look at them.