As a child i didn't noticed that, for Gameboy games Gen 2 felt huge. The night/day cycle, gsm, radio and daily events made it feel like a living world. Like i wrote, the remakes even expanded on Jotho making it even bigger.
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Besides, i'm pretty sure that a console that can handle X3 and Witcher could handle a game with 2 regions.
Yakuza has multiple cities that are full of life and those were made on hardware less powerful than Switch (PS3). It's purely a time and money problem.
it's not about storage space nowadays, it's about each region getting the artistic care they deserve. and as much as i love XBC3, like maybe my favorite game ever, i would not call the zone art direction its strong point, on top of a small amount of monsters.
Yakuza is a bit different in that they don't add new regions often and when they do, they're used as is. The games don't really change in environment very often at all. But it's also easier to share assets in something realistic like that. They're just built a lot different.
like, sure, GF could plop Galar or whatever into the next game as is. but I'm guessing the next games will have their own look and feel. but i think starting with Sun and Moon, maybe even ORAS, they've gotten better and better about taking the culture of each area and putting it into fictional worlds. i was really happy seeing that ORAS had more references to the ryukyu islands, and that the elite four was set in a proper okinawan castle!
i just think the focus of working on one culture and going all in on that each gen is better, and it seems GF mostly agrees given what they went through with GS.
I mean Johto is a smaller region, but I do think the remakes addressed that with HGSS. I absolutely don't understand it when people toss complaints of size and identity at them though.
Especially where it includes new locales embedded within the map alongside completely new/expanded areas like the Safari Zone and Route 48. I just think a lot of the dungeons and areas within the game are completely optional or have ways to run through them, so people tend to view the region as far smaller than what it actually is.
HGSS is better than GS, yes. they even fixed a bunch of Kanto GS and its stubby routes.