I mean there's quite literally a
dedication plaque at the front of the park that says it's
supposed to be. In fact, it was dedicated to California
twice (once by Eisner and then again by Iger).
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-and despite the blunders in recent years (Avengers Campus, Pixar Pier, etc.) there is still a lot going on inside the park that has at least one foot in the preverbal pool that is "California identity" (Buena Vista St., Hollywoodland, Grizzly Peak, Little Mermaid and San Fransokyo having Bay-area inspired architecture, etc.) Even once they plop Pandora in there, unless all those other things suddenly disappear, there's another name change or it gets dedicated for a
third time, I don't think it would be fair to say the park doesn't have
some connection to the California theme and by extension, at least some degree of expectation that the identity of the park be upheld when considering additional lands or attractions.
It'll be a personal preference whether or not you care about the preservation of DCA's identity. Not just there, but for all of Disney's parks. You seem content with this park simply being "a Disney Adventure Park in California" and that is fine if that is the standard you want to hold them to. To each their own. But my own stance on this is that kind of thinking is dangerously close to just being cool with something like DCA and EPCOT becoming so homogenized over time that they completely lose their individuality.
Sure, they may have differing attractions within them, but at the end of the day, any deeper meaning the parks used to have and their very purpose for being there, becomes lost and gets replaced with: this is generic Disney park one and generic Disney park two. Both exist solely to be where you come to consume Avatar, Star Wars, Marvel, Pixar, etc. and are encouraged to renew your Disney+ subscription.
Something like DCA 1.0 admittedly lacked the expected "Disney quality" at the time, but they were close to finding their footing around the time of DCA 2.0. Then, they slipped and fell the
other direction and now the park has a bunch of messy areas that feel like they need to be cleaned up.
To summarize: while you may be perfectly fine enjoying a trip to "Disney Adventure Park in California" and "Disney Adventure Park in Florida", I would much rather visit "Disney California Adventure" and "EPCOT". I think trying to uphold the soul of these parks and what makes them what they at their core is a worthwhile endeavor, albeit likely a losing one.
If that means they need to dedicate a couple extra yards to create a transition that makes Pandora make sense coming from Hollywoodland, then so be it. Of course, I'd still argue it has no place in DCA
at all. Neither does Avengers Campus, Pixar Pier, or much of the other crap they've built in recent years, for that matter.