I guess healers have it because they should heal N-amount of injuries before they can pass to next healer level. It doesnt work same with locksmith and exe because its random amount of chests/scalps you should achieve.
Right, but it' also doesn't work same with herbologist and alchemist, but booth professions have it. I know it has no use for exe and locksmith, but we like to know how many potions we made and how many plants we gathered as herbologist and alchemist, so why can't exe and locksmith know it too?