Am I the only one that thinks this mechanic works great as is? Yes, you NEED downtime to build the resource and a couple of fights don't have any (P1S/P4S). But generally speaking, you always have sufficient Addersting for every fight. And in the case of P1S you don't even need any. + In dungeons, you get them by the dozen.
I feel like Adderstings are in the perfect sweet spot right now. They give you almost exactly however many you need for each fight and it's down to you to manage them properly. If they made it any better sage would have infinite mobility.
It's really one of the few things I enjoy working towards on sage and that has made the skill ceiling nice to strive for.