It is not my job, or anyone else's, to square the circle of sound cryptography with good UX. Advice not to use broken crypto doesn't become bad advice simply because the good crypto options have crappy UX. If you care about security, good crypto trumps bad UX. If you don't care about security, just use Google Chat. Seriously: you are probably better off even from a security perspective using Google Chat than you are by using fly-by-night crypto.
If you asking, "why don't more of the people who strongly believe we need better encrypted messaging contribute UX work to the good crypto projects like TextSecure instead of inventing their own broken systems?", I'm as confused as you are by that phenomenon.