It's great you built your own tool and workflow that suits you, but there's no need to declare things 'bloated', just because they include things you don't want to use. That's your opinion. Its defaults suit me pretty well, and it's really well documented.
Cool, I hear you but Jekyll actually comes with a very minimal theme (when you 'jekyll new my-site'). Heavy 3rd party themes aren't really the fault of Jekyll.