Metallic talons as strong as metal would count as a functional body mod or an ability. Think of it this way: aesthetic modifications are limited only to form or the way something looks, functional or power-driven mods would also apply heft, powers, or additional usable strength. Talons as strong as metal could both cut more savagely and gain resistance to damage.

If you would like to change your aesthetic body mod, it’s fine to have the talons grow back as regular talons until you decide on your aesthetic change. You’re welcome to wait for a tier-up if you’re planning to send in a request.