I would still complain when something has mods I don't have cause in to lazy too download them

It literally can't

The world would have flying cars and cancer would be gone

people would be happy

honestly not much
mods on mobile couldn't support as much "power" as mods on PC/Steam, because it's a much weaker device
yes, some custom maps would be able to be installed and used on mobile, but even maps could be too much for mobile devices

@IAlsoBuildPlane THAT WOULD BE VERY PAINFUL for mobile users