The thing about this caveat is you usually hear it about "don't get overexcited, nobody's putting out their starters" or "don't worry, we've seen them do it regular season, just knocking some rust off".
It is, to the best of my knowledge, a lot less applicable to a bunch of new guys and rookies feeling their way through and looking overwhelmed by 90% football. Right now the biggest takeaway from these two games is the Steelers might not have a RT. I'd say the second is they mightn't have a QB either but I feel bad talking crap on either guy when, you know, they're in a shambles. I mean give me fifteen minutes and I'll probably be talking crap but the point still stands.