Agility can be modified by a few Plugins. I only use Lower numbers in my games for the purpose of simplicity. So I always try to keep the Player's Agility slightly higher than the Enemy for the sake of Balance. This way, Player always gets to attack first.
Only in extremely rare cases, I give Enemies in my game more Agility, Such as Bosses and Monsters which are meant to be super fast and attack first. Agility doesn't matter much with the default Closed Turn based Battle system. However, It would matter more in an Active Turn based Battle system where Individual Players get to act based on their Agility.
Because of this reason, It might feel a bit odd for the player to have Agility on Gear, Just for the sake of it. For this reason, I suggest you use Agility in Creative ways other than simply as a "Attack First" Stat.
I design some of my Skills with Agility in the damage formula instead of Attack. I want it to feel like a "Damage Stat" and an alternative to Attack Stat. You could also add it as Bonus Stat to Default Formula, So that Player has to actually build both Attack and Agility.