I’m not saying it’s difficult to explain to a buddy. I’m saying it’s an extra step people have to remind themselves of and to remember to do by mentioning it to their buddy and reviewing it. It’s easy enough for the owner of the device to become complacent because they’re used to it. The buddy might not notice that it’s different until an issue arises. I’ve observed many buddies that don’t do predive checks or even discuss different weight systems and how they work (removal and insertion) and such prior to dives. You may say just dump the weights, it isn’t complicated and you may be familiar with how yours work but what about your buddy being familiar with it and you being familiar with your buddies? Some are male/female clips, some are velcros, some are just straight pulls and/or oriented in a particular manne. Also, should the inflator malfunction, the buddy should also understand how to manually/orally inflate and deflate. That should also be explained and/or demonstrated.
Buddy checks are important but if it’s skipped, which it shouldn’t be, the consequences are more dire if the equipment is not what most people are used to. I’m suggesting to really go out of one’s way to ensure others’ familiarity with it.
I think these are valid points when you have something that is not what the majority of the diving population has.