All of these points are fair enough.
But in the end, when you travel, and dive at different sites, areas, countries and of course dive centres, it does give a little reference to the people who take you out, and have no idea of your quality or experience in diving. A log book is great for this too, when people remember them. Having an AOW card with you will allow you access to the deeper sites, if that’s where you want to go, rather than having to convince someone you are experienced enough.
When you stay in one area, and everyone knows you, no worries!
I am well aware of OW, or even non-certified people who are better than most others u/w. They are not involved in the old certification card race, and just want to go diving!
In the end, the way divers talk gives alot away about their views of diving, and capabilities. More often than not it is the humble, quiet, smiling, friendly people who are the terrific divers while the loud mouths telling tall tales seem to struggle with their gear, buoyancy, etc.....
But back to the question at hand: I have always thought a rescue course of some kind should be able to be taken by an OW diver. No need to dive to 30M to have knowledge on how to rescue others/yourself!