Honestly you're not going to have a bunch of people chip in and tell you you're right on this: the community has unanimously agreed that these are the worst Pokémon games to have ever been released alongside Let's Go and there's nothing you can say to convince them otherwise.
Especially considering Legends Arceus was announced in the very same Direct right after - which everyone and their mother agreed that it was the game that we should've gotten for the Switch from the start - instead of Let's Go, instead of Sword and Shield, and ESPECIALLY instead of BDSP.
These games didn't do much other than tick off a box that there was a remake.
Granted, there wasn't much to add to it to make it any better other than include Pokemon from newer generations, which considering GameFreak's stance on limiting the Pokedex for whatever reason, meant that nothing after Gen 4 was going to be included. Not that that matters much considering nothing originating from Gens 1-4 Evolves into anything from Gen 5-8 aside from Sylveon, Kleavor, Ursaluna, and Wyrdeer (Every other cross-generation evolution is a regional form)
They could've ADDED those new evolutions and the regional forms, but they decided it was best to stick with what was in Diamond and Pearl - and they likely weren't going to reinvent the wheel to accommodate the issues that the fanbase had with the originals either (lack of Fire Types, Pokémon Variety, Gym composition, etc.)
Nah, probably not. I think Game Freak/TPC wants remakes to go in this direction because of nostalgia and profits, it likely has nothing to do with LA. You can see that BDSP is following the same direction as ORAS and LGPE with them cutting content from third versions/remakes released in between, LGPE trying to match RBY's graphical style instead of using SM or SwSh's engine, and LGPE excluding Pokemon that released after RBY. BDSP probably would not have been that different if we didn't have LA, we'd just have even more complaints about them cutting corners with remakes since there'd be no ambitious reimagining releasing alongside it. If anything I think the opposite is true, they released LA because they want the traditional remakes to be religiously similar to the original games and a game like LA is an outlet for the kinds of ideas they used to include in games like HGSS and ORAS.
I think that LA was more of an experimental game to see how players would respond to a more open world Pokémon environment and a less linear format. There were several things that clearly made it into SV in a modified way. GF seemed to want to test the water and get players used to this type of open world.
I'd make the argument that BDSP were probably intended to be like Sword and Shield, and that PLA was more or less just built from what little assets they decided to recover and repurpose - and then the BDSP we got were sort of just created to be a buffer.
I mean, you'd think giving Dialga and Palkia Origin Formes would make a more interesting incentive to sell some remakes, especially after everything dealing with ORAS in giving Groudon and Kyogre Primal Reversion.
However, something down the line probably caused the project to split - the pandemic might have been part of the impact, it might not - and we got the games that we got.
I'd argue though that PLA may have dampened Scarlet & Violet's impact in being an open-world game (Granted, not that much considering the sales) - As PLA's trailer held some serious Breath of the Wild vibes despite it not being an open-world game, though the comments in the announcement trailer would say otherwise. Meanwhile Scarlet and Violet's reveal while it had Pokémon roaming the overworld didn't give the impression that it was open-world until it was explicitly said in the press release that it was.
