So far I got away with my 70 lb bags, even on US passes which would actually restrict me to carry no more than 3 50 lb bags. But probably the grace period for clueless aliens will be over soon.

The luggage allowance on *A in general are quite tricky and can be treacherous sometimes.
The general rule is that all itineraries which go via North America allow 2 bags weighing 70 lb each (3 bags for *G members) as long as it is an international itinerary except for US-Canada traffic.
All other *A itins allow 20 kg in Y, 30 kg in C, and 40 kg in F and an additional 20 kg for *G members or 10 kg for *Silver (that is about the only benefit for 2Ps on the rest of *A), except if the itinerary is purely domestic non-North America. In the latter case all airlines have random rules (LH allows for 2x70 lb for example) which are never more restrictive than the *A general rules.

There is one major exception, this being RTW travel. In this case only the travel between stopover points counts as itinerary.
So if you fly from Australia to Hawaii with NZ (via AKL), you can bring 2x70 ln as a general member if you do not stop in AKL. If you do so, then you will be capped at 20 kg.
Some checkin agents do not know this and these are the lovely times when you have to insit on a supervisor as they are never ever willing to look it up.