As for the original question re optimizing being essential for fun, I can only give a reverse perspective: as a mostly non-optimizer my fun is reduced when someone else intentionally optimizes in order to be better/more powerful/more one-man-band-ish than me and-or the others in the party.
Caliban, unless there is baggage coming in from interactions with Lanefan elsewhere, you
are putting words into their mouth and accusing them of some rather unpleasant things based on little to no evidence.
Stating that a particular behaviour reduces their fun, on a forum thread discussing that behaviour is no indication of actually trying to prevent people from performing that behaviour in an actual game.
Its not saying things are "all about their fun".
Its not "forcing people to play sub-par characters".
Its not "thinking that other players should cater to their ideas of how the game should be played".
Its not "whining about being outshined."
Its not "telling them that they are playing the game wrong."
Its not "wanting to dictate how others play and enjoy the game, based on their own selfish desires".
Its not "thinking that other players should play the way they do so they enjoy the game more".
And it is not "being controlling towards other players".
Its simply talking about their preference on the issue
in a thread discussing preferences of the issue.
Unless you know that Lanefan actually tries to enforce those preferences on the other players
in an actual game then all of those accusations are without merit.
And to be frank, come across more as personal attacks rather than reasoned discussion.