This question already has an answer here:
How do I make a comment? Well, this is easy, a user must have at least 50 reputation points, and comments are a privilege... wait, why is it?
How to make a remark when reputation is under 50 ? One simple would not, as "There's a reason that the software has a built-in check for minimum reputation before allowing one to post comments, and it is not nice to try to circumvent that."
It annoys me the fact that not everyone is suitable for delivering comments (although all users are suitable for asking questions). If someone is able to ask a good question, are they not able to offer good comments?
Why are new users being prevented to comment? Why is it a privilege?
A revision might solve this problem of Answers of the form "I don't have enough reputation to comment, but"
Are there any possibility to review this "built-in check for minimum reputation before allowing one to post comments", or is it a task that does not improve MSE?
Edit: After browsing some duplicates of this question in other related websites I found that Joel Coehoorn answer is reasonable.
I still think that these opinions are not based in experiments nor personal anecdotes, though.