You seem to have one mission in life: Re-iterating your belief that the 340 is failure because of its "Slow take-off performance". You consistently support your argument with SQ's swap. I may count more than a 100 posts by you stating the same old stuff. (and yeah, the only cure for OA is to get rid of the 340s and get anything else, from 744 to 346 to 763).
(a) take Economics 101. Perhaps it could be useful to your life, too.
(b) learn that a plane's mission is to get from point A to point B with as much safety as possible, generating as much revenue as possible, carrying as much payload as possible, with as much fuel economy as possible, as less pollution as possible, as much passenger comfort as possible, etc etc.
Of course fighter jets have to be able to climb from point A to point B as fast as possible, but, hey, I don't recall that the A340 is a fighter jet...
PS: I know it is too much to ask to take aeronautics 101, but, hey, stop asking the very same questions over and over again!