Salvage is useful for Firestorm though since you get extra Munis for Flamer SPs and Rocket Barrage.
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Again, it's a purely anti-infantry doctrine. In my opinion it makes no sense to require destroying (or losing) vehicles in order to even use the Salvage ability. If the rest of the doctrine would give you a Pak43, Command Panther, AT grenades for Volks or something, yeah, salvage would make sense. But not when the doctrine gives you flame weapons. Of course it isn't a game breaking issue, I was merely trying to make the two doctrines mentioned more useful and appealing by replacing an unnecessary and in the case of Firestorm unfitting ability with a more useful one, like the HMG34.
Maybe I should open a Firestorm discussion thread instead, since there are more issues with it.