People just wanna watch big ass monsters collide in silly ways every 3 years or so. They don't want dumb serious human plots (Wingard knows this as the human characters in both GvK and GxK are just pawns used to move the plot until the point the monsters take over, with the humans disappearing from the screen during the climax of both flicks). They don't want extensive cinematic universes wih hours upon hours of content (it is beneficial for this franchise that nobody knows the show exists and it is canon). Sometimes people just want a dumb sequel every 2-3 years.