That doesn't really affect the developer using it though. GP's argument that Foundation is more flexible and Bootstrap is more opinionated seems unrelated to the semicolon debate.
I disagree, I found the Bootstrap JS code hard to read and follow because of the lack of semicolons. For a framework that is supposed to help people 'bootstrap' it would seem to me that making their code understandable and accessible is something important.
I don't see how the lack of semicolons disturbed you, I actually noticed it earlier today for the first time. If you're having trouble with that you won't be able to read Python very efficiently.