Your point is valid for sure, but it doesn't change the fact that the last few FH titles have felt like movie sets or theme parks.
FH1 map worked because it felt like a somewhat honest slice of the US state of Colorado. It was just a ~25 square mile chunk of that environment.
FH3 map was very strange to me because it was trying to represent a significantly larger and more diverse area in a map not much bigger than FH1.
FH4 map was somewhat reasonable because despite the very large area depicted, the bioms were not significantly different - but Edinburgh felt so, so strange and movie set like.
FH5 appears to be representing an even larger area of real world with a map only nominally larger than FH3/4. I would rather they moved away from a contiguous world if they are going to do this - make the Yucatan area and the Sonoran/Baja area separate otherwise it feels unreal in a distracting way - again, the Yucatan is 1,500 miles away from the Sonoran Desert! The city of Guanajuato is about halfway between the Sonoran Desert and the Yucatan, which kind of explains why they have included it, but between Guanajuato and the Yucatan is Mexico City....are they just going to pretend it doesn't exist? It's the second largest city in the western hemisphere.
I'm pretty sure I would generally prefer the approach I think TDU SC will be taking, a faithful 1:1 recreation of a modestly sized real place.
I mean, the map size is definitely not game breaking, but it is weird and it kind of hamstrings the experience for me. I don't feel like I'm in an open world in FH, I feel like I'm in a snowglobe or a Truman show kind of thing.