Personally, I believe a call sign should be REQUIRED for posting a comment. A "read only" login with no call sign would be appropriate, again, in my opinion. This would allow someone exploring the idea of getting their license the ability to get information to get them started.
I have always wondered why someone, who went through the testing process to gain their license(s), would not want to make that known when they are posting a comment.
Again, my opinion, it would give the person commenting, much more credibility.
Just my $.02.
73 de Jim - KE8G