I get what you are saying, bubba, but as noted before, Wrestlemania was never *just* about the wrestling. The first two editions had Mr. T, and on Wrestlemania 2 he had a BOXING MATCH against Roddy Piper. Besides, considering how they made WM a two day event, plus the NXT event that happens on Saturday afternoon, it becomes harder and harder for someone to not have their big pay day because a part timer was featured.
Like, it makes sense that they are rolling out nostalgia acts or crossover talent or whatever that is popular and outside the wrestling spectrum because Wrestlemania is their event which appeals to the masses, to the mainstream audiences, to the Regular Joe and Joanna who aren't so much into wrestling but appreciate a good dose of spectacle.
To make an appropriate comparison, the Superbowl is a bit similar to Wrestlemania ever since it had those big damn halftime shows (thanks MJ). Sure, the event is the final game of the season, but many people who are not into the sport have their eyes on the musical number associated to it.
You need your biggest event to draw as many eyes as possible and widen your scope.
This does remind me of when Bad Bunny, who is legit one of the biggest musical acts going on today - and might be one of the biggest draws in history - was announced for Wrestlemania, some complained, said "who?" and pondered if god damn SALIVA wouldn't be a better name.