Basically what the title says. The other classes have class forums where discussions around the class are held they aren't limited to AL discussion so that is not really a fact as to why the Blood Hunter couldn't have one and it is a class you can build on the site. I feel it would be a used rescourcewhere players can discuss the class without getting in the way of other forums and it would encourage conversation. (Since I feel conversations about the class and builds and such are limited due to them not having a class forum for the conversations to occur.

I think Blood Hunter would fall under homebrew and house rules and probably an argument could be made for discussing it there, seeing as it's not official content.

Homebrew and House rules I see as more a place to discuss things made or being made under the homebrew system. Blood Hunter is a class that while not official to WotC is a whole class supported by DnDBeyond and with the ability to homebrew subclasses for it. Classes I feel even if not official should get a bit more space for themselves especially as the site has no plans for making custom classes a thing on the roadmap based on prior dev updates.

Why not have a critical role forum then?

 I don't think having a "Character Class" forum for "Homebrew" or "Other" would hurt. Especially with how popular some 3rd party classes (such as Blood Hunter) have become. I could see a lot for Blood Hunter, Gunsmith, and even Pugilist and such. 

My main thoughts on these are Critical Role as a general rule would surely come under the streaming section of the forums in terms of discussion zones for discussion of the episodes and content which is what most of the Critical Role forum would become if you made it an option.

Gunslinger would surely come under the fighter class forum likewise for similar subclasses that already have a class forum, yes some people may not like it there but they are a subclass for that class header, the class forums do not prevent people from discussing 3rd party subclasses for that class. It is just a place where people can chat about matters effecting the class like what is your favourite subclass, what do you think of this ability, does this backstory fit, how about this build, etc, etc.  

The point is Blood Hunter IS supported by DDB as a class option if I hover over the classes section I can click on it. This is the DDB not WotC forum, people may not like it because it is not official but DDB support it, so why not support it on the forums with its own class forum. Though I guess an other for Class Forum could work but that would only be true if DDB were thinking of adding more 3rd party/homebrew classes in the near future.

Just wanted to say I would also like to see this. Again, because it's so fully supported, and I wanted to know more about DDB's timing for the 2020 update.

Quote from Cecilao >>

Just wanted to say I would also like to see this. Again, because it's so fully supported, and I wanted to know more about DDB's timing for the 2020 update.

 The updated version is almost implemented and will release after the 2 week charity window on the DMs Guild is finished