The time penalty of thorough salvage got removed a few months ago, so now its just a straight up better version of the normal salvage. Same time and +12 muni for wrecks/weapon teams and +36mun for abandoned vehicles.
How is that useless?
It's not hugely impactful, but I agree that it's really not an "useless" ability. Salvage in general is a really strong feature of OKW.