Why exactly is it not possible to help a party member whose gear all breaks during an instance? Let's say your healer is so new to the game that they don't know about dark matter and repairing their own gear during an instance, like what just happened to my party. It would be really nice to be able to go, "hey, I have all my crafts leveled, let me repair that for you, no charge!" or, "hey, I have all this dark matter on me, let me give you some!" It's impossible to carry on with a completely broken healer or tank, and it's impossible to help them out, so the only options become either vote dismissing that player for really no fault of their own, or vote abandon rather than make that poor healer take a penalty, again, for really no fault of their own.

TL;DR we really need to be able to repair others' gear or trade them some matter during dungeons. Seems like a pretty reasonable thing, and we used to be able to, so why can't we anymore?