I mostly just wanted to address that there are queer people who find representation in fandom despite shitty source material and despite straight slash shippers stomping all over their sexuality. However, there are also queer people (queer women especially) that don't feel the slightest bit represented by fandom because of the fixation on straight white dudes.

Exactly. And interestingly enough, in my subjective and non scientific observation, I've noticed a lot of queer ladies who ship femmeslash, which is the corner of fandom that gets the LEAST amount of attention.