Considering how people excused ORAS's dumbing down and removing the Battle Frontier by saying "it's a remake of RUBY/SAPPHIRE, NOT Emerald!" despite FRLG taking JPN Gen III elements and HGSS taking Crystal elements (and ORAS removing stuff in RS to begin with) I'm not at all surprised that people somehow think being inconsistent by removing held items/abilities yet keeping pointless features like natures is a good idea and totally not baffling in the slightest.
For me at least, my criticism and anger is from the fact that I know Game Freak can make better, lengthy, and more enjoyable games for all, and better remakes. We went from the highs of BW2/HGSS, to lower and lower points every year until SM launched, only for it to continue to dive afterwards as if nothing happened. The best Pokemon game in modern memory, hands down is Super Mystery Dungeon, since it feels like a love letter to past entries and does a damn good job of feeling like the final chapter, and the devs put their all in it. You don't really feel the sense of finality in modern pokemon games, despite being a factor behind GSC, and that's because everyone knows the franchise can't die. Even if the games somehow do, the anime and merch lines will go strong, and I sure as hell still buy lots of TCG stuff, among other things.
Considering how Pokemon games became yearly all of a sudden, it's also very concerning that they seem adamant to just make profit on nostalgia while also making each new game replacable.
Nobody will stick around for LGPE once Gen 8 hits. If Gen 8 feels like yet another Pokemon game instead of something memorable, nobody will feel motivated to replay Gen 8 when Gen 9 hits, etc. People replay Gens I-V all the time, and even GO is replayable and lots of fun since it's being updated a lot. Those games are still the most popular to mess around with, and that's because they don't feel like throwaway games to meet a yearly quota.
That's why fans are mad and disgruntled, since this could have been a remake worth revisiting every few years or so, yet I have a feeling more people will replay FRLG on their youtube/twitch in the future over this game.
I will agree though that I don't think people should be so vile towards those willing to give this game an honest shot. I think the main reasoning for that is due to fear this will sell millions based on name alone, cementing that this idea is good in Game Freak's mind.