I indeed read the entire thread before responding - that's why I'm aware that not all contributing voices are on board with your suggestion. However, even if I were the only voice in disagreement, I would still make my argument. This is what I believe, and as an LGBT game dev I have a stake in the outcome of the debate. Let's try not to marginalise dissent with appeals to majoritarianism - it rarely leads to a just outcome, and it is an odd position for anyone attempting to represent minorities to take.
Further to that, I made absolutely no assumption for the community as a whole in my reply - I simply represented my own views on the matter, and pointed out that not everyone in the community is coming from the same place. Ironically, your last post makes a number of assertions representing yourself as the voice of the community - which I don't accept.
Returning to the meat of your argument, many folks would also not feel included in LGBTQIA - rendering it an inefficient solution to the problem of inclusion. Another thread would simply start up requesting LGBTQIA2S - then LGBTTQIA2SA - ad infinitum... If all these tags are to become visible searches, they will end up clogging the search system and leading to players missing out on content they might otherwise enjoy. Since each game is only allowed 10 tags, creators would also be in a bind - they surely won't wish to make all 10 tags variations on the LGBT+ theme, but they won't want to be missed out on each of the individual searches.
LBGT - as the most generally recognised umbrella term - seems to be entirely adequate for the search and tag functions (which are, after about functionality and ease-of-access rather than addressing any questions of inclusion and community). I am, however, somewhat more supportive of a separate Queer tag - owing to its combination of sexual and political orientations.