And if you don't have artillery or other AoE weaponry, inferno SRMs turn them into popcorn.
Ah, but now you're stuck having to bring a SPECIFIC counter to deal with something you don't even know if you'll be facing.
What if you didn't bring any artillery or infernoes?
What if you didn't bring enough infernoes? That SRM-2 isn't going to squeeze damage out fast enough to be useful. Ideally, you want double SRM-6 packs to whittle them down FAST, and now you're talking about having to have very specific mechs to do the job.
What if they brought fireproof Salamanders?
Meanwhile, whatever you send in with SRMs is going to be taking fire from
their SRMs too. And they can fire A LOT of SRMs your way.
It's not that there aren't solutions, it's that you have to build your whole lance to be able to take care of them even if you don't know you'll be facing them.
This is bad game design in general, but it's obscene on a cheap filler unit.