As I wrote, both my sons did AOW on a LOB in Cairns just after having been certified OW here in Italy.FWIW course went exactly as I expected. Just a PADI shakedown scam. Did a couple days of decent diving but I’m going to be honest, AOW teaches exactly zero useful skills. Can’t wait for the Super Advanced Open Water card we all have to pay 400 bucks for in ten years to keep diving. Without your Turtle Identification speciality, your Introduction to Bowline Knot speciality, or your Converting Between Metric and Imperial Units speciality you will be SOL.
That’s my opinion, feel free to your own. Decent dives so I’m not mad but I think it’s a PADI money grab scam YMMV. Sue me.
I think AOW is simply the second, more practical part of the first diving course, as taught by Cmas, Bsac and other no-profit organisations. Padi divided it in two parts, issuing two cards, for grabbing more money.
It is actually quite useful for a novice: after OW only, one is not really an autonomous diver.
Doing AOW after years of experience, instead, is substantially useless, as you have found.
But you needed the card...