For me, most of your concerns arent very well-founded. Especially considering we only got a 40 minute demo of a old build. And the first isle was very well sized. You wont see any complaints from me about whats literally the tutorial isle.
Regarding park cosmetics... I think there will be some cosmetics available. Considering the preorder bonus is vehicle and helicopter skin. Its likely that this can be implemented for other things in the game.
And its already proven to be 2 rides in the game so far.
I feel the same. I could understand if it had been released for a year and nothing seems finished, but we literally saw a 40 min clip of a demo build showing only what the company wanted us to see . It wasn't even a complete game. He also spent weeks trying to tell people there were only 28 dinosaurs in the game and argued it like it was a fact. I honestly think he is more troll than fan.