Oh absolutely [1]. But the HTTP/2 endgame is likely to re-define it in terms of a protocol over QUIC, a situation the QUIC folks are eagerly anticipating [2]. This is no surprise considering both originated at Google.
QUIC is a secure transport protocol (subsuming most of the features of TCP and TLS) that runs on top of UDP (because they wanted to craft a 'better' TCP, and the only other not-blocked-by-default transport protocol is UDP).
Since Google pushed it into Android Chrome, I cannot log-in into our customers WLAN infrastructure on Android 4.3 only with 4.4+ devices, not even by disabling it via the flags menu.
And some of our devices are on 4.3 and now need to make use of HSDA for network access.
