I agree that the "T" is rather an awkward bolt-on to "LGB"; it doesn't really match. I think it was just added on because it seemed like LGB people would be natural allies to T people (which they sometimes are not...)
I also disagree that most crossdressers are not on the "T" spectrum. This opinion may be unpopular, but I truly believe that the vast majority of crossdressers do suffer from some level of gender dysphoria. I think this is true except for fetish dressers and drag queens who only do it for entertainment.
One reason I think this is the occasional thread that asks "If you could magically become a woman, would you?" and most crossdressers say yes. So there is some longing there, though not nearly enough to actually take difficult steps to do anything about it or to jeopardize existing relationships and career prospects. I think it's really a matter of degree rather than kind.
