It's not just "takes care of it for you". The constraints and assumptions are rarely mentioned, so every other thing is marketed (sometimes by its very owners,

It's not just "takes care of it for you". The constraints and assumptions are rarely mentioned, so every other thing is marketed (sometimes by its very owners, sometimes by the community) almost as a miracle that is - unlike its puny predecessors - "just works". Creating an impression things are easy. My usual story with every new library, toolkit or framework (with the pace JS world's moving, it's new one for every new project) is that I start with "oh, nice" then find myself knee-deep into the its gory intestines, trying figure out how some "magic" works and how to make it do things I want or need it to do. No fun at all.