If your players really don't care, then in some regards you're quite lucky.
But some players - and I'd count myself among them, though I've seen and played with far worse than me - do care.
If something doesn't make sense, that's fine - but I'll still start looking for the in-fiction reason why it doesn't.
Geography in particular. If it's not believable it'll bug me forever.
Last night while at a friend's place I saw she had on the wall a big printout of a randomly-generated world-scale map she's using as the homeworld for the game she just started. It's a very pretty map, with loads of potential for placement of cities, adventure sites, and so on - lots to work with there.
So what did I notice first of all?
I noticed that it's all too clear that the map generator's programming doesn't allow mountains and sea to be anywhere near each other - they're always separated by large areas of plains or forest or swampland - meaning that features such as the BC/Alaska coasts, the Norway coast, and volcanic islands such as Hawaii and even Japan can't exist. And that bugged me, if for no other reason than I live in one of those very regions.
(and if you can't have fjords it likely follows that you won't have Norse, and a D&D setting without Norse in it just isn't worth bothering with)