I don't really know what Gatsby is good at because I've never been target customer of it. But judging on website and docs I think its power lies in simplicity:

I don't really know what Gatsby is good at because I've never been target customer of it. But judging on website and docs I think its power lies in simplicity: people want to get shit together and call a day. This tool allows that. It probably won't live long, but that's not a problem, right? Most websites built with it are short lived: promotion www, sales, register forms etc.