why so much players have a rush mentality

[AnnRam]

so much people just want to speed run / rush any content and never even care to see of the rest of the party is up to it. as a tank its extremely frustrating as people liek this never want to communicate and force the way they want to play on you.
what you think of this?

Because all the content excluding savage/ultimate are extremely easy/boring and it takes too much time to clear. In dungeons mobs don't even hit you and bosses die so quick that sometimes you can skip their phases.