I suspect that transgender activists are also acutely aware a lot of their credibility came from being associated to the LGB movement, which is why they are very quick to attack any movement that seeks to distance itself from their causes. They want that credibility that comes from being able to call themselves LGBTQIA+++, same reason they always want to associate themselves with legitimate intersex groups. Annoyingly, they're also making an active push to solidify their power and make it seem at though LGB people owe a great debt to the trans community, as if LGB would not have existed without them. Hence why they retroactively apply the trans label to historical figures, claiming that Stonewall would not have existed without them, and so on. It's an obvious power play.