You have the rainbow which literally means something along the line of "the entire spectrum". That is a neat, simple symbol that can include everyone in the LGBT+ community — But that symbolism doesn't work when you also want to be able to point to a specific area of the flag and be able to say "this is for that particularly group", "this is for that other particular group".

I applaud the intention to be more inclusive of trans and bipoc people and I'm not trying to be dismissive of the unique challenges they face. I'm just kind of mildly grumpy that a side effect of this is worse flag design.