It's not about elitist at all. I do sometimes join learning/clear party to help and teach 'em how mechanic works.
For that i personally don't mind beat that raid or fail.
Normaly peeps in that party thanked to helper and said "learned a lot. Thank you for your help."and disband party.

But somehow for my alt job need to farm that in rush to.
And joined "FARM"party then at begin of battle pops up first timer reward.
We said "Lets give it a shot" and that first timer didn't knoe mechanics at all. He died tons of times that occured healers mp runs out.

It doesn't happen once or twice
Happening every day and most of times on "farming party".
So I'm strongly support OP's suggestion so we can prevent disbanding after few silly failed for "FARMING PARTY"