There are two students, student 1 and student 2.
Student 1 and 2 are both passing their lectures. However, student 1 is passing with high grades. While student 2 is passing with lower grades. Student 2 is happy by just passing and don't care about getting better grades.
It is exactly the same situation in-game. Some players are happy with just clearing content, while others want to clear content with high performance and try to do better every time.
The only difference, your performance in-game will affect the entire team.
You cannot force people to play on the same level as you, and you cannot make them better players by giving them harder content. They might just quit or wait until they overgear content to clear it. They might as well ask for content to be nerfed.
The difference between a good player and a bad player is the time they spent learning.
If the player has no motivation to search/watch/read guides and learn from them, they won't get better.
To those who say that the player base is not bad. The dev team themselves have acknowledged that the player base is, in fact, performing below their standards. Which explains why they are trying to make content easier, and even trying to simplify rotations.
So just because you had an expert with no deaths/mistakes, it doesn't mean that every player in that party was good (I don't want to go into deep details about this).
In the end, everyone is playing to have fun. But don't put yourself in situations you are not suited for. By doing so, you're ruining other players fun.