That's precisely why people are asking this feature. The risk should not be there. No one's saying the current system is bad for those who want to get into random groups, for that purpose it seems to work rather well like intended. But as previously stated in this thread, that's not always the case. Some time the helper is not out there to be good samaritan (or to want fast boss only run) but wants to get some of their friends out of a pickle. Not all people have unlimited playtime. Besides, the other three random people would be as welcome to ask help from their own spheres of acquaintances.