It seems like with this approach you are limiting different opinions.
Yes. That's kind of the point.
This site is not a discussion forum and we are really trying to avoid as much opinion based material as possible. Instead we want to see extant teachings of various groups explained from those groups' respective understandings. That's what answers should consist of, not people's opinions (right or wrong).
The comment function is deliberately limited to people who have posted a few regular questions and answers and gotten a feel for how the site works. Otherwise everybody that comes by off the internet would want to drop comments and turn every post into a discussion.
Even with 1 rep you are allowed to post questions an answers. Those are the bread and butter of the site and we encourage you to start there if you want to participate. Once you learn what is expected of regular posts it will be more apparent how comments are supposed to work and by that time you will have enough rep to use them.