This is good news. I admit I previously made themes that would make @Justin Tadlock's head explode out of frustration.. jam-packed with (self-written & built-in) features that would for sure render your site useless if you switch it out for another theme.

It's been a long time since then and now I'm a huge proponent of building stuff the proper "WordPress way" (this is another discussion by itself). Now, even though my new unreleased theme doesn't include new functionality, uses Underscores, supports Jetpack and all it's modules, and passes the Theme Check plugin. I'm curious to see what I'm still missing.