The issue here is the skill cooldown reset. It's often the case where you have just wiped and have 5 minutes till next instance entry, but if you will change to DoH for repairs, you will reset your 5-15min skills and in some cases force others to wait for your cooldowns (or will be forced to go and pay 5k/item to npc even if you have all crafts lvled) Also its weird how someone else can "Repair All" your gear and you can only repair single pieces of your own gear, don't you think?