I would just like to point out something about multiple gear sets for a job. With how many don't even attempt to follow a BiS formula in the game currently, do you think they will get multiple sets for multiple occasions, especially when there is so many jobs in the game? RIP inventory space.

It doesn't make sense for this game. It just makes people not want to take on more jobs than one, which kind of defeats the purpose of the armory system. This was even a thing in FFXI. It wasn't simply a ton of grind that made having multiple jobs hard, it was inventory space that held a lot back.