Again, I think your argument is completely apt, and theres an argument there certainly that new games should be fully featured at launch. I just think comparing a decade old, 8-dlc game and a brand new one is kinda silly. MK8 is certainly superior in spectrum of available content, hands down.
I only played the demo (waiting for a sale) and I think crossworlds is significantly better than MK World. I don't think theres any competition there. I was dunking on "Mario-Kart-like" as a genre-title in that message though, sorry that wasn't super clear. Kart-racer, FPS, procedural dungeon crawlers, diffcult/brutal action (or Massocore but i haven't heard anyone use that since 2008 born and died with Super Meat Boy I think) and Search-action all have better more descriptive genres people can use.