I never could tell a difference on live between a hybrid-heavy grind group and a percentage "perfect" group. Optimal pulling the exp bar is just slow regardless because the game was designed to be evil.
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My nightmares are etched with the groups that should have been perfect. I mean, two rogues, a trusted warrior, cleric, chanter, etc...yet we couldn't get our shit together to save our lives. CR's with ninja tactics? Fun stuff.
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Putting together a group shouldn't neglect a certain role. It also shouldn't exclude certain people who are competent and can play their class to the fullest.
Ever do the math on taking 10-20% longer to kill a mob or getting 80% percent of the exp you normally would? It's not as big of a deal as people think. Holding a camp comfortably is better than shot nerves.