1. if they wanted to do that they could put insane grinds into the game. This is more of an issue of FF14's "Respect the time of the player" mentality, where even small playsessions should feel like you can achieve something. Which is good, but makes longer playsessions unsatisfying for those wanting that.
2. fair, really.
3. true, but what about people that want to play multiple roles?
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Generally I think the lockout method is a good base principle to make sure you can't go ahead too far. But sadly there is very little to do once you have reached the small lockout gates.