The last few comments on this thread are a really not useful. Each aircraft fits a specific mission. There has been mentioned of needing redundant engines, needing hours of engine operation time, etc, etc. We are not flying airplanes, they are gliders first with motors to allow either take-off or the abilty to sustain.

There is no right answer, each fits the needs of the pilot. Some may want a few miles of sustaining (traditional turbo or non-launching FES), some may want just enough to launch, some want both, snd some want redundant systems so they can fly out of reach of safe landing sites.

Each design is a compromise and ultimately has to fit the needs of the owner. There is no right or wrong design. Arguing over which one is better is like arguing over which flavor of ice cream is better.