In my own words, racism is a thing to be abolished. But terms like that do not help, quite to the contrary. Oh, and I also do not approve of adding letters to lgbt for the same reasons.
Here's the trick though: you don't get to decide what other people call themselves, or what helps with racism. People affected by it do. People who feel LGBTQIA+ describes them better? They know better. Listen to them.
On a similar note, you don't decide what counts as female representation in fiction, or what matters. Listen to those impacted by it.