simplistic!
Nick L. and Idle Stop,
Yes, I was intentionally being simplistic!
Twin a/c we have are good strong machines. Designed well and tested extensively.
It's very easy to find the weak links in the machine if we just concentrate on specific performance criteria...ie.. perfect Cat A flight at all flight envelopes and weights.
Sure, you guys can put extremely powerful engines in the a/c, but at what cost?...... no payload and minimum fuel!!
However, I do see a time when some 12year old, Playstation addicted, geeky kid, turns out to design lighter, more powerful, smaller engines.
You guys, as engineers, must acknowledge that is possible in the future.