Parsers is also why we get healers and tanks who can't do well. That DPS player wanted to play a different role now. A win's a win. If it's a farm, then it should continue as it was going. When you force your DPS to push phases (even though following normal mechanics saw high success rates), you tend to burn out the player quickly.

Not only that, but then your definition of "farm" is "speed", so mechanics get ignored and people try to squeeze that last bit of damage before they move out of aoe.