Flexbox is the saner API we've all be waiting for, in my opinion. I'm curious what the author's objections to it are. That's really my problem with the whole piece — statements like this are thrown out there without much justification or explanation.
And their reasoning makes sense. I totally get why they would avoid constraint-based layout.
I disagree with the rest, but yeah... that's a sore point.
There's the javascript being bad with no explanation. As if there's something bad with developing tools for the javascript adept to contribute to a platform.
Browsers already doing too much comment. What? Would this person rather the team create new tools from scratch instead of leveraging a tool that the target market for this project is already using?
Notice that the "good" parts have very little or nothing to do with web development and a good number of the "bad" items do. I believe this person is not one of people intended to make use of this tool.