I guess it's like when modern developers make the new God of War and just call it "God of War" lol
They don't do Dragon Ball JRPGs anymore, the last one was Dragon Ball Fusions on the Nintendo 3DS. So I guess that starting from Dragon Ball Z1 / Dragon Ball Z Budokai 1, there was a soft reset of the whole videogame series.
I read various articles about the development cycles of Dragon Ball videogames, and that first Budokai was a turning point for... a variety of reasons.
Basically, there was this Hokuto No Ken videogame on the PS1 that sold very well, and the publisher at the time saw the enormous sales potential of creating nicely packaged anime tie in videogames.
So when they started working on the first project on Playstation 2, they decided "Okay, no more low budgets projects from here, no more Final Bouts or reskinned Butodens. We're doing things big".
Dimps, the developer, made a first draft of Budokai 1, and it was murdered because the characters looked absolutely horrendous. What we got was the 2nd version of Budokai 1, with improved models.
This philosophy on making the games look and feel nicer is the reason that the sequels (Budokai 2 and 3) got such huge visual improvements.
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