It also seems to me that in the process of writing answers good enough to gain five upvotes, you learn enough about the site that your comments will be in keeping with the general site ethos (which I suspect is also why the ability to comment is one of the ones you get for free on your second and later SE site, by virtue of the "active member" 101-point bonus).
In general, over the years I've thought that rep privileges came in at about the right level. The requirement for rep for various priviileges isn't so much a prize for success, as a requirement for sufficient amounts of participation and immersion in the ethos of the site that you'll use the privileges (broadly) in keeping with the site's intent.
That said, kindzmarauli, kudos to you for not doing what a lot of inexperienced users do, and posting your comment as an answer (which then has to be flagged, converted by a mod, etc.). Somewhat less points for posting this to SF rather than meta, though!