The Internet loves to create hiveminds, so finding a well-populated and active forum that isn't completely positive or negative is a rarity these days.
Depending on where you go, I actually observe more "toxic positivity" then I do negativity nowadays. I can understand someone finding the discussion as being too negative and not something they would want to participate in but like you said, so much of the stuff said here is valid. It's not people b*tching for the sake of it.
And it's not like Hot Toys is a small business, towards which people are more sympathetic and understanding. If they could, and no one cared, they would absolutely cut corners. Hell, it took f***king InArt to come around to force these guys to step up their game.
Also, I see that people are often more critical about the things they love. Because we know Hot Toys is more than capable of doing better. And the same people "complaining" right now would undoubtedly be willing to pay more (myself included) if they were presented with a figure that looked like the custom.