to suggest something like this means you do not know the purpose of the Duty Finder at all.

Duty Finder was introduced to help players who are new to the place or could not find a group for certain contents find groups and to also get Veteran players back into older content to help those players.

If you are looking for players with the same skill level as you and/or perform at a personal expectation level then that is the function of the Party Finder.

When you sign up for Duty Finder you are signing up to work with a group of random players of different skill level.