Join party in progress

[Sida]

And not everyone is going to have friends readily available to help them with an in progress duty.

I get that. And in that situation they would get the next person who was ticking the "join party in progress" for the other reasons, just to run it for random. But as others are said, if I have an hour to play, I have decided I get some gather done, for once, and my friends ask help to get out of dungeon I could agree. I'm not joining in because I want a dungeon run. I'm joining in precisely because I want to help those particular people. Earlier the same day I might have done a roulette with ticking the "join in duty" just to help any random group. They are not mutually exclusive options. The game could have both. Just, tool for a purpose.