Pan is a particularly slippery label. Much like the Teflon inside of them.

It can be used in multiple ways to obfuscate one's sexuality:

If you're straight you can use it to become spicy with plausible deniability, by chalking any lack of attraction to one sex down to "compatibility". (Doesn't work if they know you well)

if you're gay you can use it to get homophobes and TRAs(frequently one and the same) off your back with plausible deniability in much the same way. (Also don't work if they know you well)

If you're bi you can use it to get Trans/Enbys who feel excluded by the 'attraction to 2 sexes' definition off your back. (Becoming redundant now, as the definition of bisexuality is morphing to include more than 2 genders)

Anyway, Pan is a double-edged sword for trans in particular. They can feel included by it, but not gender-validated.

It's there but intrinsically unsatisfying; Like eating mock meats. It's akin to someone asking what nation(s) you are a citizen of, and you respond with:

I'm a citizen of the WORLD!

I mean that's good and all that, but at the same time it's not really saying anything...

One last note. It's useful for eroding someone's boundaries. Because if some self-identified pan rejects you, just identify as any of the genders and accuse them of bigotry against that particular one with some ethnicity/disability/neurodivergence intersectionalism tossed in. The woke crowd will support you, and so they'll cave eventually to your designs from peer pressure.