I don't believe that PADI has a threshold - only that a person has completed OW.
Basing this solely on my own aspirations to be only a recreational diver and nothing more, I might have said the same thing until I actually got the AOW certification and experienced what it was for me. I'm one of those who got it so an op wouldn't say I couldn't do a dive without it - haven't needed it yet
I agree about building up one's diving experience, but don't see it necessary for what AOW actually is, as long as the person is comfortable in the water.
PADI uses the phrases "advance your skills" and "this course is truly about having fun and gaining experience" on their website. Other than diving deeper and navigation, the required dives, a person could choose to do 3 other adventure dives that wouldn't require working/focusing on their actual diving - maybe enriched air (the option without an actual dive), boat, and maybe fish identification or naturalist. These type of "adventure dives" are more or less informative over diving experience. As long as a new diver understands that the AOW course has nothing to do with becoming an advanced diver, I don't see an issue with going right into it - it may peak a divers interest to dive more or advance themselves beyond AOW by completing specific specialties/courses.