Looks like using a sledgehammer to crack open a nut. LOL.
??
It is an aircraft, designed as a passenger aircraft (= it is not too tightly tailored), Pegasus engines are in mass production, engine-out situation on a fully laden A/C is manageable without much of calamity (unlike on most of ww2 twins), one set of crew for a lot of cargo or soldiers etc. Longer ranges are easier to achieve with 4000 HP than with 2000 HP.
Actually, most of the reasons that 'guided' people from 2-engined startegic bombers to 4-engined types apply.