It's part of being jaded. Once they've mastered the role and play with those who also mastered the game, it all becomes quite unsatisfying and boring.
Repeating the same Ex, Savage or Ultimate no longer provides the same thrills. The encounters scripted, memorized to the second, the inevitable victories, hollow..
The only optimizations they're left with is getting in more Glare, Broil, Malefic, Dosis and to see how low they can let the party HP drops to without wiping. There's those who parse runs to compare rDPS, it's the wins here & there that provides the little joys that make it worthwhile, like when they use Dissipation and spam Energy Drain on cooldown & manage to rank up on fflogs.
Then there are those who find no joy at all to playing a healer, so they play other roles, or on the forums.
