Movies and series that depict a multiverse get the most important part wrong: the infinity of it all

In Avengers, dr Strange famously finds only one reality where their plan worked. In Rick and Morty they have to be really careful about ditching a dimension and replacing themselves in a new one because there's a limited amount of similar enough ones.

But according to basically the only thing that the multiverse idea has going for it, the amount of universes/dimensions/realities is not a fixed number but an infinite amount. Meaning you'll always be able to find another one that's exactly like yours except for something so small or far away it can't really matter.