Pyros are worthless till those green or blue flames crawl up your hives hidyhole. Pyros main issue been getting enough of the green/blue flame canisters to do anything, they have to be careful with not running out of there special juice.
Otherwise just too many pyro PFCs make the Pyro spec well somewhat lame.
Also the queen can resist those heats in lore I think, the queen actually is a one man army that should murder a whole platoon like ours like it was child's play. It a 15 ft monster that can brush off bullets and run at 25mph. It can and will murder the shit out of an army. Now the queen can't resist the those heats forever and are meant to get hurt eventually but they are very very tanky and resilient to flames.
https://avp.fandom.com/wiki/Queen_(caste)
Ravagers, no word on flame resistance. Instead they would be 15 ft monsters that can probably cut open a tank like it was a can of sardines. It could 1v1 the queen and come out on top. Yea.
https://avp.fandom.com/wiki/Ravager
The predalien take note couldnt fight ethier the queen or ravager probably lore wise.