[Squirrelloid]

Sometimes you *want* the AI to overcast by spending extra gems. I've definitely handed out e gems to E1 mages so they could cast Summon Earth Power. Handing D2 mages a d gem to cast soul vortex is also common for thugs. You'd have to totally redo scripting to get what you want in 'scripting to spend gems'. And the AI is notoriously bad about what it considers a significant threat. (Yes, a single GR is enough threat to convince a 500 troop army to have its mages blow their entire inventory of gems).

And logistics is not fiddly micromanagement. The entire game is about logistics. (All good strategic-level war games are about logistics) I suppose we should remove supplies too so you don't have to worry about feeding your army and possibly forging and carting around magic items which produce food? And maybe we should remove having to actually move troops - just let them teleport at will within our territories - so we don't have to fiddle with moving troops around.

Manipulating gems hardly takes that much time. It requires provisioning scouts with a gem supply to resupply in the field, sure. Its an excellent logistic dynamic, and it takes maybe a minute or two to figure out how many gems to carry. I'm not seeing the major time component here in supplying combat mages with gems.

Now, if you wanted blood slaves harvested from provinces to go directly into the national vault, that has a lot more to recommend it and less logistical justification to avoid doing so, and would address a lot more time used in micromanagement. Sadly also not possible to mod, and there are disadvantages to doing so. (Bloodhunters do a decent job protecting themselves right now because they have immediate access to the slaves they harvest).

Edit: It bears noting that your proposed solution doesn't actually solve anything since you can still spend 'hours' fiddling with gem usage, you're just doing it at the scripting stage without having to worry about resupply. This actually makes it worse, as you can totally rescript on the fly far from any resupply point to use as many gems as you want and/or have, and thus could spend even more time effectively 'fiddling with gem use'. Whereas needing to plan ahead limits your possible gem-use and thus constrains the space of possibility. (Unless of course your army is sitting on a lab). tldr; your 'solution' only makes it possible to spend even more time to gain advantage.