mmos are kinda cool in the way that their worlds are always expanding and ugrading while still keeping a large chunk of the foundation, simply building off what exists rather than creating something entirely new
if only more singleplayer games had a similar structure. imagine if the elder scrolls games were not released seperately as completely different games, but rather just added each province as an update to the existing map of tamriel
it'd be a lot of work, but so very cool