By AF1 I did mean the original AF. My point when I made that comment was that maybe Job gear should at least be something that you have to earn while being on that job, thus showing your proficiency in the job. The game already doesn't let you Need on gear without being that role in a dungeon so at the least the idea of getting first dibs cause you made the effort to fulfill a role is present. There's other avenues to gear alt jobs equally without being on the job (AK, Coil, eventually CT as well) so it's not like that option is completely taken away from you.
It's not naivety, I do realize people will no-life to max. So what? These players exist in every single MMO They exist right now with people that have max DL or HQ crafted gear for all jobs, all relics, all crafting classes. Max gear ASAP you say? 5~ months to max Myth on all jobs is ASAP? Especially when you have to put in 9 times the effort? I would say, at least I have a reason to log in. I don't even necessarily agree with how we get Myth gear either. Grinding easy dungeons for job gear equivalent to gear that drops from the hardest content is about as equivalent to grinding fates to level cap.
I do find it funny that you mention that the game doesn't halt your progression and then say that it does the very next sentence. Once you cap your levels, part of character progression is getting better gear, so yes, it does halt progression. We don't know how SE will go about progression in future patches but they have already hinted that it's not going to change. When new gear comes out (the new top tier) older gear will be easier to get... but it's still the same situation that we are at right now.
This entire argument is moot anyway since the Devs officially mentioned they aren't changing anything. People that want to maximize multiple jobs will just level multiple characters.