Okay, this has been repeated ad nauseam, but there are no locations in any of the Star Wars films that are prominent enough to build a land around that also don't limit the land from changing and evolving (which, I strongly believe, it will). The closest usable location would be Tattooine, but then they're limited to the locations on Tattooine instead of an all-encompassing land. 95% of the Harry Potter series takes place in and around Hogwarts, Hogsmeade, or Diagon Alley. It's obvious if you were going to build a Harry Potter land, it should obviously include Hogwarts and also the familiar shops and eateries from the series. And then you have Cars Land, which was based on a franchise with one movie (at the time), so obviously you're going to build Radiator Springs. Star Wars, on the other hand, has a 40+ year legacy behind it in addition to 10 films and countless other media like the TV shows and video games. Generations upon generations of people have their own opinions of what Star Wars should be and I doubt you could ever get fans to agree on one specific planet from the series to limit everything around.
I wish more people understood this - creating a new planet where they can bring elements from all facets of Star Wars in one location was the smartest decision they could have made in terms of building a land htat fills the current ultra-realistic theming trend. The only other option would to build more of an abstract "Star Wars Greatest Hits" land, or again, limit an entire franchise by choosing one planet such as Tattooine.
Galaxy's Edge feels VERY much like a place that would exist in the Star Wars universe and is very in line with most of what we see in the films, which are often more run down slums with a touch of sci-fi. Batuu is like a nice mix of multiple planets we've seen. Futuristic sci-fi locations like Coruscant or Canto Bight wouldn't work because they stand out in the films as being affluent and different from most locations we see, and they would be harder to convey the feel of Star Wars because they would risk just looking like "generic futuristic sci fi city".
Batuu/Black Spire Outpost is awesome and beautiful. Their only mistake, in my opinion, was setting it during a very hard-defined point in the timeline when that aspect could have been left more vague, allowing for more elements from the OT, or at least not "Han Solo and Luke Skywalker are definitely dead at this time".