Thanks, I am skeptical towards the claim that it will encourage people to write comments rather than answers, pretty much because comments don't give any kind of reputation (and I don't necessarily mean upvotes).

Some scares to get downvote that's why they don't answer on question. But if they don't answer than community can't know his idea is helpful or not

If people aren't answering because they are "scared of downvote" then, to be blunt, they need to grow up. If you think you have a good answer, post it! If it gets downvoted you can leave it as is (if you are convinced you are right and the downvoters are wrong), change it (to satisfy any concerns) or delete it. If you don't know enough to answer because the question is vague, confusing, etc. that's what comments are for.

manassehkatz‭ I don't recall ever not answering (or questioning) because I was afraid of down votes, but I disagree with the approach you described here; you can think that people need to "grow up" as much as you want but if istiak is right and that's a common factor than the community should adjust itself to that "human nature" if it really expects content from the people it relates to; if not, it's fine but there would be much less content.