It doesn't have to be /b/ but in reddit's current form lack of free speech is a problem too. Power tripping mods are banning people for commenting at all in certain other subreddits. Politically inconvenient subs are getting qurantined if not outright banned. Similarly hateful but politically fashionable subreddits have been allowed to stay for years now. Politics permeates almost everything and if you don't share the ingroup opinion then it's not worth commenting. Granted a lot of this has to do with shitty mods and not reddit directly, but they aren't working to fix this either.