T-C (et al):
Don't you see this as an example of the K.I.S.S. arguement. - Simplification of systems. Less is more. Too many chefs (engines) spoils the broth. One reliable engine is better than two unreliable etc
(BTW the military capability of 225! R44's has got to be superior to 1 EH101, and you can keep 225 R44 flying with 12 ground people! Ok so for the military lets build in some redundancy and call it 100 people! how many ground people to maintain 1 EH101?)