Yes, every situation is different. As I mentioned, I wouldn’t have sent my younger nephew on such a trip. It wouldn’t be the meltdowns in unfamiliar situations that concerned me. He used to have those terribly when he was young. I don’t notice them much now. He’s a super sweet, positive kid. Loved by everyone in his community. But we went on such a trip with him a few years ago. The biggest issue was his tendency to just wander off. He’d see something he’d like and he’d be gone. Someone had to watch out for him all the time. And he loved to just walk up and talk to strangers about odd things. This might be cute for a kid, but a 20 something year old guy it could be seen as creepy, though I think most people could tell he wasn’t “normal.” But then the other concern is that he is so sweet and trusting, anyone could easily take advantage of him too.
My other nephew has some of these issues too, but the wandering off problem wasn’t there.