any "beyond universal growth" story ends up answering what is "beyond this universe". a macro grows beyond the universe, so what do they see? sometimes it's a multiverse, or they become a god who can recreate the universe. maybe they grow so big that "space and time no longer apply to them". sometimes the macro breaks the fourth wall to go beyond the boundaries of the fictional story. these stories end up describing a type of ontology of the universe--"what exists beyond physical matter".

you also sort of invoke ontology in order to sell the sense of scale for macro characters. in order for a fox to be gigantic you have to explain what he's larger than, and very often the stories have a sort of "size heirarchy". you have people -> buildings -> cities -> countries -> continents -> planets -> solar systems -> galaxies -> etc. macro stories let you ask questions like "does this chain ever stop?" or "what is the largest thing in the chain?". (it often turns out the answer to "what is the largest thing?" is "just me >:3").

most city-destruction macro stuff isnt as ontological though (i guess thatd be, like, normal structural engineering?)