DD1 hasn't had it, as it wasn't available when she was little. I researched for the same reasons as you when DS was born, but we knew we might be moving remote, and in the end that was my decider. I had looked after lots of kids with it, and it was horrendous.
We don't have any gut issues or intolerances. Mine all were exclusively BF. We do live where there are some spectacular bugs and often dodgy healthcare and so DD2 has had it.
Neither of my kids suffered any ill effects from it at all.