"You pull, you tank" is a bad mentality

[Espon]

A real world comparisson could be if I went to stand outside a Wallmart store and surveyed 1,000 customers about a chocolate bar... If the comon opionion opinion was it was flavorless you wouldn't dismiss that as just a Wallmart customers opinion. nor would you call it a "vocal minority" because the millions of people who didn't take the survey or dont shop at Wallmart must think the chocolate bar is amazing.

Companies have spent billions on consumer research and the results of all that rresearch often says that for every person that complains there's 25 people that share the same complaint but remain silent about it.
Source

This isn't the same. You're asking people for their opinion, they are not volunteering it.

“Only 1 out of 26 unhappy customers complain.” means absolutely nothing if we don't know the total number of customers. How many happy customers were there? Did any of them say they liked the product or did they all remain silent?

People that are unhappy are far more likely to voice their opinion because they think it'll cause change. People who are in agreement are more likely to say nothing because they're happy how things are.

[LeonKeyh]

The assumption here is that they "don't want to play". The fact is not everyone is at the same skill level. [...]
The bottom line is if you don't have the patients are desire to deal with players who may not live up to your expectations then don't use roulette.[...]

Skill level _doesn't matter_. Tanks play the EXACT same way at 1 group as they do 2 groups as they do 3 groups as they do 4 groups. They sit there and AoE

This right here pretty much says everything that needs to be said on this topic.

Healers are the most affected by the number of enemies that are pulled, not tanks. If anything, healers should be the one determining how much to pull. If a healer or DPS pulls, they should just bring it to the tank. If the tank lets them die, the tank is wrong. Period. End of story. The tank can certainly ask if the person can stop pulling.

This isn't the same. You're asking people for their opinion, they are not volunteering it.

“Only 1 out of 26 unhappy customers complain.” means absolutely nothing if we don't know the total number of customers. How many happy customers were there? Did any of them say they liked the product or did they all remain silent?

People that are unhappy are far more likely to voice their opinion because they think it'll cause change. People who are in agreement are more likely to say nothing because they're happy how things are.

That's....that's not how statistics work. We don't need to see the total number of customers at all because based off the statistic you can extrapolate the total number of customers based off the number of customers that complain.... But that has nothing to do with the point that they're making. The point was that if you see a group of people complaining, then you can expect that 25 times that number are ALSO upset, just not complaining about it.