I do see that there are many questions about having a reply button but they all refer to this question for the answer:
This link allows users to install a script which does it for them; however, if I am a new user coming to this site, chances are great that I won't find that script. Instead I will post a reply to a comment not knowing I need to put @user in front of it and then that user is never notified I commented.
While the @user method works once you know it, it is not very intuitive for new users. A simple reply button would be far more intuitive for new users. This could greatly help productivity of the OP's to get their answer as well as for people attempting to help to know when the OP has responded.
Without a reply button, I have seen so often that new users simply type their response to a comment and therefore I am never notified. I can periodically check those questions I have commented on but of course I am not going to do this forever.
Why has the community been so against an actual reply button instead of a work around script?