This is a complaint mostly about the bootstrap DSL. I agree the changes between each major version are non-trivial. So much so, I've basically not updated some

This is a complaint mostly about the bootstrap DSL. I agree the changes between each major version are non-trivial. So much so, I've basically not updated some websites because it's too much work. And like the author, I've tried other frameworks and they have their corner quirks or get abandoned. But, Bootstrap is the only one that has tested time, and sits in the 'just works' camp. Once I've learned the DSL, I'm incredibly fast at how to structure UI elements (assuming the designer followed the grid, which is hardly a guarantee). Still, 100% agree on the pain of upgrading.