Note that in the quote above "use" refers to security researchers trying to send malformed traffic. The only usability difference between HTTP2 and HTTP1(.1) i

Note that in the quote above "use" refers to security researchers trying to send malformed traffic. The only usability difference between HTTP2 and HTTP1(.1) is that it's easier to write a broken implementation of a quarter of HTTP1 and still do some useful things with it. A full, production-grade HTTP1.1 client or server is more or less as complex as an HTTP2 client or server. HTTP2 is actually easier to implement at the base level, since it's much easier to work with binary protocol formats than with the horrible string encoding of HTTP1. HTTP2 does add a lot of complexity with the stream multiplexing features afterwards - more or less enough as to cover the endless headache of deciphering HTTP 1.1 requests and arcane connection headers.