I wonder how much is to do with a kind of impatience?
One thing about accessibility issues - they can be darn hard to achieve, can vary really widely between individuals, and in some cases it's impossible to make accommodation. But they are usually pretty immediate, it's possible to see the shape of what accommodation would look like. It's just hard.
With issues like race, or sex, often the problems are more opaque, and there is no way for, say, a school to address them. They are socially wide issues, that miht take generations to change. Or cultural issues in some cases that people might not want to change, or patterns around physiological issues that again, people might not want to change. So also, tricky, and long term.
With the LGBT stuff, it's all pretty simple. Just say, now we are inclusive. There is nothing actually restricting a gay man, or a trans identifying female, from holding down the same jobs as everyone else. They aren't more or less likely to have worse educational opportunities, or to make choices around reproduction, or anything else like that. They are essentially like everyone else in every way that is important in terms of employment.
EDI, in my experience, is a shallow way of thinking about equality, and so it likes easy answers.