What is missing in vanillaforums
I state that for years I manage very large forum using vbulletin but I also used phpbb, smf and mybb.
I find it really vanillaforum a forum well done but lack the basic things that makes you decide to install it in your site.
The first thing is a graphics well done ... I installed Bootstrap theme and it is very nice. Why do not you put the theme of defoult?