Yeah, what Platinum has in its favour is a slightly better story and better first teams.
If we look at this correctly, BDSP addresses and succeeds in solving what was wrong with DP:
- Slow paced game;
- Limited pokédex, narrowing our teambuilding options (I remember fire types only being 2 families: Chimchar and Ponyta lines);
- Challenging game (BDSP has better team movesets and strats, most of them competitive, even on first matches);
- The HM usage required to traverse the game was too high for bad attacks that couldn't be easilly forgotten back then;
- Making competitive teams was too time consuming and tedious without the Sw/Sh QoL we have nowadays
Nobody can complain that BDSP doesn't solve DP problems. It's a good game in that aspect. On top of that, we got the Underground expansion and revamped Contests.
In the other hand, we can think about that BDSP is mainly DP with gen 8 QoL. What we can complain about is that probably BDSP could have a little more new content, like bringing back megas, improving the Galactic plot (like Platinum already does), or adding some kind of post game episodes and inherit some of Platinum's improvements like the Battle Frontier and first-battle team compositions. Also, some developing choices are indeed questionable, like:
- the chibi artstyle, making it for awkward cutscenes and weird pokémon-human scale when pokémon are following you (in my opinion this visual aspect shows no improvement since HGSS in 2009);
- the Amie bullshit being bound to the following pokémon;
- the untoggable full party expShare.
In short, this game can either feel satisfying or disappointing. It all depends on what you look at it and what aspects matter to you. I'm a bit disappointed because I expected more for Sinnoh, but I think this will be a good Sinnoh experience afterall. They deserve my props for the cool AI teambuilding strats, I was not expecting that at all!