I've seen this sentiment here and there but I've yet to appreciate it... I've observed co-workers that do this and while they do get very handy with their selected subset of tools, they tend to use far less of the available ecosystem than a promiscuous copy paster, or a framework user, like me. I think its got a lot to do about temperament - some people like more control over less, and find the secret squirrel magic below somewhat sinister. There is no way that I would be able to build spacemacs from scratch, but I do benefit a lot from riding the integrated magic beast, even if it sometimes go into holes no amount of cursing and praying can prevent.