Are the Yakuza games not all quite similar to each other?
you'd be surprised how different they feel game to game. trust me if they had been as similar as arkham city/origins i would have gone insane by yakuza 3 lol. each game is unique and has its own identity even if the beat-em-up mechanics don't change until they replace them with the rpg mechanics in y7. and yeah, a lot of assets and areas get reused but...idk it feels different since they're all so closely based on actual real-life area.
as an example, maybe some of the old PIMItes remember my japan trip in 2008 (at one point during my homestay with a japanese family i accessed #pimi through a web client someone made and for some reason pretended to be a japanese person who had just stumbled upon it. no one should ever be sixteen years old.) here's a pic i snapped, at the time because i saw sega and monkey brain like video game
i know exactly where this is in kabuki-cho, the real-life equivalent of yakuza's kamurocho setting. if you keep walking to the left of club sega, down that street, you'll eventually run into millennium tower. if you hang a right and walk down that street in front of the club sega, you'll make it to pink street, which is the area where all the cabarets are. the intersection before this one takes you to the mahjong parlor, although im certain theres way more than just one mahjong parlor in japan.
there's also new areas and minigames in each single game. yakuza 0 has two major areas to explore: kiryu has kamurocho in tokyo and majima has sotenbori in osaka. yakuza kiwami 1 and 2 are kind of unique since they're full remasters--have fun with the pissing minigames in yk1 i think. maybe they're in yk2, i can't remember. yakuza 3 adds okinawa, yakuza 4 adds three new playable characters, 5 has FIVE unique areas to explore, and 6 is primarily focused on an area that's not in any other yakuza game.
in short, if those two arkham games were cookie cutter out of laziness than the yakuza series is cookie cutter with a purpose. even kamurocho changes and evolves over time. and so many of the places you can visit and stores you can frequent are actual, real places. you can buy a Mountain Dew from Don Quijote in real life, and you can buy a Mountain Dew from Don Quijote (Donki for short, enjoy the jingle that will get stuck in your head) in yakuza 0.