Apart from some things, it's quite damning that a single person came up with better suggestions than the entire W3C/WHATWG. Namespacing; scoping; HTML Imports with lazy loading, inheritance and contexts...
The WHATWG was founded as a response to the push from the W3C to try and push everything to XHTML. HTML can never be improved, that belief is at the heart of the WHATWG, even if they don't openly admit it. The best you can hope for is endless Javascript that occasionally have angle brackets sprinkled in.
Your feedback really stands out here dude. I'm hoping that the whole conversation here and some of the frustration will lead to something even better for OOHTML.