Lore speculation is fine in the Donkey kong series and Mario RPGs, since those series feel the least self contained in the franchise, and care about continuation of story.
Things like Mario mainline(mostly), Luigi's mansion, and Warioware, Peach showtime, etc. feels like self contained or status quo adventures that only want you to try the new minigame-like gameplay gimmick they thought up for them at the time. So lore stuff for them is minimal in care.