I don’t think forcing people to trade with others is the solution to anything. It is not like there is a vendor you can buy things from. Many people don’t like doing trades with random other people they do not know.
Runes are not Mythic items, you should be able to get the rune you want by yourself. Especially with over 40 hours of game time, doing the event, helltides, pit, and undercity and lair bosses.