Your accusation of people being too lazy to learn their jobs is indicative of someone who may not have had the opportunity to work with enough people from different health and societal backgrounds. Having worked with both children and adults with special needs as well as people in situations that do not support a steady and enriching learning environment, I can tell you for a fact that these people, whom someone in your position would assume are lazy, are always the ones that try the hardest and put in the most effort when given the opportunity, and while many do improve quickly given the proper environment, there are also those that take longer and require alternative methods to fully grasp the material. It's people that jump to conclusions without putting themselves in others shoes that push some of these good people into giving up their efforts for self-improvement.
With such a large number of players, I'm sure there are a variety of people from that play this game from different backgrounds and life situations. I think our community simply needs to remember that perhaps Duty Finder and Duty Roulette are all that some people have to learn and clear content, and it's these types of people that the two systems were designed for. Duty Finder and Duty Roulette simply are not the the place for seeking your "one and done" or "one death and kick" parties, and there is a better system called Party Finder for that where if the group isn't up to your standards, you may simply leave without penalty.