To an extent that's true of anywhere you go in Japan, until you've worn Tokyo out. Tokyo is not like any other city in Japan, and if you feel like there's more for you to do there than you have time for, then you should stay there. I did that for about my first 7 or 8 trips to the country. Even now, after 17 years of visiting once or twice per year, I still haven't found anywhere in Japan as fun as Tokyo. Some people are just like that. Other people need more variety, or nature, or historical stuff, or they just like quieter cities. I'm a Tokyo person; it's really all I care about in Japan.

But I'm not sure what it is that you've seen/read, but it doesn't seem to describe Okinawa. It's a pretty unique combination of modern Japan, ancient pre-Japanese ruins/historical sites, and beach communities, mixed in with Korean, American and other cultures.

You don't have to want to go there, but as someone who has pretty much worn out Tokyo over all my visits, I never regretted my time in Okinawa. Even with all the rain I experienced on my visit there. It's just not like any other place I've been. I've been to the north, the west, basically all over Japan. Everywhere else I've gone feels either like a poor-man's Tokyo or like rural America but without as much wide open space. Okinawa feels different. I have nothing familiar to compare it to - it was the first really new experience in Japan that I'd had since my first arrival in Tokyo.

I'm just saying it sounds like you have kind of a misconception about it. But as someone who felt the same as you about Tokyo for a long time, I think you probably would be better off wearing out Tokyo before moving on. Until you do, you may not be satisfied with anywhere else.