I wouldn't even go that far... I don't think my inventory can handle multiple gear sets, I have one for PvP already and it hardly fits... Put unique stats on gear,
but copy Final Fantasy IX instead, let us unlock those stats after using the gear... They recently gave PvP presets for the AP you can put into PvP actions, so something similar could easily be possible for PvE... You'd get gear, obtain stats from it, set AP into some of them, then have presets you can switch between... Gear becomes somewhat more valuable, albeit temporarily, but we'd have room for horizontal progression with that, with none of the drawbacks of having to lug around multiple gear sets for single Jobs... I don't think we have the inventory space for that...
Arguably that creates a divide where new players are left behind and need to grind up more stuff, but Final Fantasy IX let you set stuff just from equipping the gear with it on, and AP was limited such that you only selected a few traits, rather than using all the ones you've unlocked... As such, a new player in Scriptures gear could have instant access to enough traits to spend all their AP on, all SE needs to do is balance it such that tomestone stuff is generic and fairly useful for everything, while other stuff is more specialist... Then it's just a matter of going out and grinding this kind of thing to get slight bonuses, which is something that already happens with this game anyway... Someone who goes out and just gets a full set of Scriptures gear is likely to have too much Accuracy, and they're also not using Food or stat Potions, which puts them at a slight disadvantage to anyone who has min/maxed stats and used the best consumables...