I don't necessarily agree. Sometimes you see around a lot of comments/posts that are either just bs or clearly made to get as many zaps as possible without necessarily offering good content. Now, I often find myself in the situation of willing to reply to call out bs, but also zapping the post/comment would mean upvote it to some extent, which I definitely don't want to do.
There are [at least] two things that are absolutely finite for human beings:
Time, and Bitcoin.
Forcing yourself to zap before you reply makes you more aware of the reality that by responding, you're expending a finite resource.
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