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Apart from some of the opinionated "you should be doing it this way" stuff, if your not using a lot of this your probably providing a sub optimal experience for someone somewhere using an old browser. I guess it depends how much you care about backwards compatibility over just building for the latest and greatest, each project will be at a different point on the scale of what they need to support.

You're right; I don't care about IE. As a result, I need a lot less code.

Initializr is a little more bare-bones, you can create your own package and customize it a little on their site already. It's based on the HTML5 Boilerplate but haven't got as much stuff in there. I use it all the time. http://www.initializr.com/

HTML5 indeed buzzed, but take it as a library where you can grab stuff, or just plain reference.