But what's the marketing ploy? "You shouldn't only do OWD but also AOW, because ...??" Clearly some reason has to be offered for people to actually do it.
"fear" pitch - you don't know what you don't know...
"ego" pitch - you can go right to DM in the "zero to hero" scenario.....
"honesty" - your class really didn't give you enough to dive where you want (or where we go)....
pick any, pick many...
It all means more $$$$ to the shop, and in this day and age, modular seems more appealing than the "grind" of the "good old days"....(okay, the can of worms has been opened - feeding frenzy!).
FWIW - I was trained by a "Not For Profit" - YMCA, and actually never even heard of AOW until I had been diving for a year or three...(also, we weren't "limited", except for recreational limits, and commen sense) . Never denied diving because of my lowly certification.