I don't even know why you would compare Xenoverse (a fighting game with a Hub World) and Kakarot (an action-RPG). They're literally not even in the same genre.
And of course this is going to have more loading considering all the voice acting and cutscenes.
Xenoverse is not a fighting game lmao, is an RPG, its even classified as that
The battle system is similar in Kakarot, you float in the air, have two button combos, you hold the shoulder buttons to bring up the menus and select from a set amount of special moves in both games, vanish works almost the same in both games
its just a variation of the same thing, except this game is focused around dodging than spamming moves and managing stamina
Just because it has a versus mode doesn't mean its a fighting game, fighter z is a fighting game