maybe that comes from the fact I've been diving 15 years and he and I dive with our kids just for fun. Not sure the situation would be the same if I went OW ,AOW, Rescue, DM in 2 months.
If I were to assume this part of your post was in any way responding to my post just above, I'd point out that what I described above started with AOW.
With PADI you can not start the IDC until you have been a certified diver for at least 6 months. That means I'm really a Nearly Zero to Hero, but it just doesn't have the same "ring."
There was one candidate that was just nearing 6 months when we started AOW. He did not make it through DM the first time, maybe not even his second time. Myself and my classmates other than him were all divers of at least a few years.