Yes. It means that particular 30 weight lacks the cojones necessary for the job. Truth is, all grades of M-1 oils are thin already. So, it's no wonder the 30 weights can't cut the mustard with respect to A3. But, it's North America...who cares about A3, right? Truth is, Mobil only needs to be as good as what else is on the shelf. What other 30 weights OTC are A3? I can just think of one....the German Syntec.
If your engine requires an A3, why would you skimp out? Why not use M-1 0-20 then? It's not A3 either...but, Ford and Honda say it's OK. Do you see what's happening?
All manufacturer's would tell you to use WD-40 for engine oil if they could. The thinner, the more fuel efficient they are. Longevity? Well, that's for the engine/car manufacturer's that care or care that the engine lasts beyond the warranty period. For the rest of us, there's 3k oil changes, auto-rx or a new car/engine.