How dare you, I mean how dare you, request the healer improve at their job.
/s
Flippant response aside, You seem to understand the concept that there are a lot of players that dont even play their class right (out of lazyness or ignorance), but this isnt a problem to you? Yes, doing your best is important, but if your efforts to do your best is ham-stringed by other players, are you ok with that?
This would be like if youre in a boss fight and someone has wiped you for the umpteenth time - At what point do you actually get frustrated and say "Hmm this is a problem player who is preventing me from doing my best?" And what do you do about that frustration? According to some people in this thread, saying anything in party is a no no. And to demand or at the least ask that players have a basic level of competency with their role and class is out of the question. What do you do? Just walk away from the group and be like "Oh well, guess Im not clearing this."
Be realistic here: Most people get incredibly frustrated in a team work environment if someone is messing it up or slacking off. No one likes to carry the slacker through the hard work.
And this is the crux of the issue. This isnt a black and white issue where players are either 24/7 max dps give it your all try hard status or otherwise youre a trash casual. It's an issue where what is being asked for, for everyone's sake is a modest amount of role and class understanding. You dont need to do your best in every bit of content cause thats not realistic. No one is 100% all the time. We all have off days. But there is a huge difference between an elite player slacking off vs a casual. The elite is gonna miss timing windows, or possibly mess up a CD or rotation. A casual slacking off is "Press 1 or 2 buttons and dont bother with class or boss mechanics." The performance difference is pretty noticeable.
Part of this 'elite vs casual' friction that you see is because there is such a huge disparity between the two groups, and that disparity grows when they (the devs) keep dropping the skill floor. We can fix some of this simply by requiring more of our fellow players, but what comes along with that is the willingness to help them improve. You cant say "Git Gud" but not provide any help to get there. If we keep doing this nonsense of "Not my business/not my problem' and "its ok to do the bare minimum and press 1 button while you get carried", youll just continue to get more of what we get - bigger and bigger disconnect and discontent between the two player groups.