Why this is bad: Google is saying "I don't care whether or not your browser can view this site, I won't even let you try."

If more online properties go this way, we effectively give Google the exclusive ability to develop and drive the Web platform at a fundamental level. For instance, Servo, an experimental, highly-parallel rendering engine written in Rust, won't be able to improve the efficiency or security of the Web as a whole if it's not allowed access to the Web in the first place.