The "Dexit" controversy is something that I feel undermines the time crunch that GameFreak is in right now, so I'm glad a lot of people here understand.
Sadly, this isn't about time... Look at X and Y, they modeled 700+ Pokemon from scratch, and did about 7-8 animations counting Pokemon Amie. It took them 3 years to do this.
However, GF has been working on Sword and Shield for 4 years, and all we saw was reused models and animations for Pokémon. And they even took out some Pokémon, even though they had the data they needed! I think that's why people are being angry over this...
...Personally, it doesn't really bother me, since I'll probably do two or three "Galar-only" play throughs, to get to bond with the new mons. As long as the Pokedex is big enough (and there are lots of Gen 5 mons), I'm fine with it.