To be fair, a lot of it can come down to people not getting into huge discussions about things they deem unlikely, so the pool of topics seems smaller than it would otherwise.
Like I could go on and on about how Code Name: S.T.E.A.M. could offer a cool playable character, stage, music, Assist Trophy, and over all aesthetic addition, but due to the fact that less people know about the topic, it likely wouldn't last as long as something more in the limelight, like Captain Toad's lack of jump or Pyra's lack of pants.