Yep. Rancho Gordo bean club member here — when I transitioned from “beans are okay but a lot of work to make a way I enjoy” to “I should make an effort to try a new recipe every two or four weeks”… it took about a month for my stomach to normalize the assault, but now it’s no different than anything with fiber.
Fellow Rancho Gordo bean clubber and I saw the same thing. If I really go hard, like eating them with every meal for most of a week I'll notice it building up but otherwise not really.
Yeah, I eat beans all the time and don’t have any reaction to them. Anecdata but in my experience only people who eat very little beans react to them. But I haven’t researched it.