I must first note that this forum is really great, and people love it. Quick Navigation, friendly interface, modern design, looks good on mobile devices, differs from other forums that are still suffering from old style (and slow) navigation etc.
On the other hand I have to make a couple of positive reviews:
Database - although Redis very fast and scalable database, there is a problem when huge amounts of data. Database is excellent for fast applications, caching, analysis (small forums) etc. but I'm not sure what will happen with the memory when huge amounts of data.
I noticed that almost every addon (plugin, theme) is broken. But it's not so terrible.
Why some people avoid this board is that it is impossible to initiate session or to check whether a user is logged. This option has almost every forum and it is a great disadvantage.
With all the positive things that provides this forum, there are some major flaws that "rejects" some users.
Of course, keep up good work.