Its worth mentioning that NodeBB runs perfectly without Docker. And if I remember correctly it preforms in a more unknown way.
Multiple reply buttons on newest nodebb
From my aspect, it looks it is not necessary to have two reply buttons. Anyway, it is very subjective opinion.
But, if there are three buttons, we must handle that...I think..
The reply button under each post is used to make a direct reply to the post. The blue reply button makes a reply to the topic itself.