they don't always, sometimes its boilers or crushers
even if there more ravs than other t3s,
i dunno what you mean by the 1 to 3 ratio
even if there are as many ravs as specs, the ravs dont have their combined utility so its still uneven, more to balancing than just numbers
ravs job is hampered by flames dealing them damage, period, they are not bulky enough to take anything more than tickle damage from it, (also OOC it would prevent newer players from trying to fight in fire because it hurts, I mean even these days some ravs are scared of fire) and they need to stop it from being utilized so ubiquitously by the opposing side as it really fucks up xenos in general
queens job is not ravs job, her flame immunity exists just to prevent her lighting up as she gets chased down due to being the highest prio target, she has better things to do then deal with a dude that has a flamethrower
if you were a marine with this 'antineuro' armor, you would not want there to be a reduced % chance for the neuro to hit you, you would want 100% immunity
fire (unlike acid attacks) has the utility of being able to be useful outside of directly attacking xenos, this is what I meant by 'flaming everything else'
-you can use it to deny xeno attacks at reinforced positions with support for a very long time, because they will just refuse to pass through it
-you can use it to clear weeds/sticky, giving light ahead and making xenos back off
-and fire also performs the same sort of role when a queen screeches/attempts to screech, it denies everyone else from following her and significantly waters down the power of that push by the xenos (fire watering down lol)
vomiters are on par rarer than T3s, and they are by far easier to deal with than any of them
neuro means they have to get close enough, combined with their low speed/being chased down to be in a dangerous range
going back to what you said in a previous post made me think about how ravs are immune to 1 type of spec (pyro) and with the acid armor buff specs would be immune to 1 type of t3 (prae) just putting that out there