Indeed! When I first saw people eating green mango I had a similar reaction to when you saw the son jump up on his relative with an iron bar.

YOU ARE DOING IT WRONG!!!!

But...they like it like that I guess. And in the end, it is also delicious! But I definitely have a sweet tooth and am patient, I always favor the ripe fruits ;p

I'll have to look out for unripened jackfruit in coconut milk though, that sounds like a delight!