They're kind of welcoming and accomodating with that. I've sent some drive-by PRs towards NixOS and it was always very easy and productive interactions.
But I guess it's more complicated at that scale. You can't just do whatever like in smaller projects. Someone needs to be in charge of money and finances, there will be dissent that doesn't just go away on its own. And mid- to longterm decisions need to be made. Architecture decisions and sometimes that's not easy and might be contrary to what the community needs and wants right now. It's just a lot of overhead, but larger projects work quite differently from smaller ones.