I get your point but sales and familiarity don't always equate to a better game. The original pair will obviously sell more and thereby foster more familiarity within most older players. But an objective analysis would arrive at the conclusion that Platinum is just a superior game to DP in every significant way, map included. Platinum has a far richer and more exotic landscape compared to DP. I find it hard to believe people would be turned off by Platinum's map just because they are more familiar with DP's more simplistic one.I think the map difference is because Diamond and Pearl sold far more than Platinum, so people would recognize how Sinnoh looked in the original two games more. People would probably question why the map looks different than they remember if they only played DP. The snowier aesthetic and other map changes would seem out of place since it is not how the game actually looked. For BDSP, people would probably notice something is off if they are calling it a remake of one set of game, but have the region otherwise look like a different game.
Its kinda how Kanto in Gen 2 looks a little off when compared how Kanto in Red and Blue looks, because they did not use Kanto from Red and Blue! They used Kanto from Red and Green instead, with the tilesets being changes slightly for Red and Blue, so to people who only have seen Red and Blue, Kanto in Gen 2 looks different than the Kanto you have always seen. Is it a big deal, no, but it took me over a decade to realize why i always thought Gen 2 Kanto looked off.
BDSP is in a weird situation if they were to take Platinum's map instead, because there are enough visual differences between the two making it more obvious that there is something different going on.
And the Gen 2 argument doesn't hold too much water only because Gen 2's Kanto isn't exactly a strong selling point. It's infamously barren. GF would've probably been better served to use the RB Kanto instead of RG if they were willing to invest the development resources.
Almost like they're trying to gaslight us into believing the third versions never existed. It's a bit bizarre actually. It doesn't make much logical sense to not use the objectively superior third versions as the template for remakes and add bits and pieces from the pair versions as needed. Seems they're doing the opposite for whatever reason.I genuinely think most people who didn't know about the Platinum changes would just chock it up to visually updating the game alongside everything else.
Assuing they even remembered "hmmmst wait the DP hearthome was a lighter shade, what on earth is going on here, hope someone got fired for that blunder" - like 10 people probably
Likely it's just a similar reason to ORAS: they for whatever reason what to triple underline bold THESE ARE SPECIFICALLY REMAKES OF THESE, NOT THAT, ergo they take everything from the original pair and almost nothing from the enhanced version, even though they'd be perfectly fine grabbing a few things without incident.