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I think it's nice that it changes when it comes to the aesthetics of the game and overall worldbuilding, Alola and Lental being good examples.
If the series was to have a consistent, static, evergreen set of symbols, then it should have happened back when the series was starting, up to Gen 3 if being generous. That's not so say they can't do that now, but if they do, I hope regional sets stay and players have the option of which ones they want to see in the UI like how there used to be one for the frames of text boxes.
Also because I find the BDSP set to kinda suck overall and I don't want it to stay. Here's hoping the symbols in OP's image will be the ones used for LZA.
