Aye. I'm all for games that make spaces where the players can do their own thing, but if a system makes a principle out of expecting the players to compensate for incomplete or contradictory material, and they don't provide any supporting guidance or tools for doing so... I'm gonna give 'em the side-eye.
(Especially a game that works so very hard to position itself as the gateway to the hobby--there are other TRPGs where it'd be more reasonable to assume prior experience and skill on the part of the players, like Roll For Shoes.)
Does the spell lead blades work on melee weapons that are being thrown? Does the damage increase still function from the throw? So for throwing axes, which are both a melee weapon and one that can also be thrown, would lead blades work?