What are you on about? There's no penalty for declining participation in a full party. You're not making any sense.
That's exactly what it's for. It specifically lets you say, "I do not want to play with anyone unless they've cleared this already." And that has always been the only feature of it that actually worked. Practice Phase 1, Practice Phase 2, and Duty Completion were never enforced, and people entering for the first time could choose the Duty Completion option and waste everyone's time.
I said zero about forcing farmers to help people. I said, and you even included this quote in your reply,
You don't need a raid interface whose sole feature is a previous clear check. You just need the game tell you if anyone who is in your pre-formed party hasn't cleared the content, before you queue, so we can skip the part where you're pissed off because you entered the raid/trial and immediately disbanded because somebody didn't respect the party finder comment.