I have noticed that to comment, you need 50 reputation. Could someone please explain why? I think it is ridiculous and others (at least one other) shares my thoughts (see https://christianity.stackexchange.com/questions/44756/why-were-the-thieves-who-were-crucified-with-jesus-crucified?noredirect=1#comment123884_44756). I am hoping for someone to shed some light on the subject.
This is a question an answer site, not a discussion forum. A large portion of folks arriving at this site off the Internet are expecting a discussion forum and this is a major attitude adjustment they have to get over to use the site effectively. The 50 rep barrier is to make sure that people get off on the right foot and realize right away that the focus here is on question posts and answer posts, not comments. Once they understand how those basic building blocks work and have demonstrated a basic proficiency with them (1 good post or a couple mediocre ones are enough to earn 50 rep) then the feature is added in and we hope they will understand when [not] to use it.