The comment info text says "Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”."
That's why I was flagging these kinds of comments as not constructive whenever I encounter one of them. But here on scifi & fantasy when I had a look on my flagging history I got the impression it is not that way.
Since I noticed like 10 of my last ~15 flags of this kind just got declined.
But if comments like the first comment here, which is just saying:
Thanks. That was really helpful. – eleanora Oct 12 '15 at 20:13
...are welcome on this SE page, shouldn't this text on the comments-form be removed then, to avoid people might be frightened off to post "+1 thanks man" and that alike?