I have advocated using the expression "gender and sexual minorities," or the acronym "GSM," as the collective political term for people who are not cisgender and/or heterosexual. So it was welcome news when UK therapists came out this year in favor of a splendid refinement of the term.
We have realized that employing the alphabet soup can be disempowering, as it excludes many people whose sense of identity is fluid. We want everyone to feel as if they are part of our community, not as if they do not count because "their letter" is not there.
A large percentage of mainstream America currently does not even understand the differences between sex, gender, and sexual orientation, and the expansion of additional acronyms only helps to dilute our unity and message.