Just remember

Everyone in your group 2, was once in your group 1.
We all went in with friends, using the party finder or just the Raid Finder.

I can't speak for everyone, but while I queue for completion/completion I will still do runs within my linkshells/free company for people who have not done completion.
YES going in with people who have not completed is harder. you get everyone from no-video watching, never seen phase 1, to people who have died to enrage quite a bit.
NO I don't really have sympathy on this. I spent days, litterally days, in queue and dozens of hours in the fight before I got my clear. I shouldn't have to go through that every week.