Nicely put IE.
Having worked with Whirlwinds, Pumas, Chinooks, UH-1, and as senior management for AS355, EC135, EC145 and changed fleets for some of those operators, the difference between old and new fleets is that “the operators” are not used to the new fleets...yet. Mostly though, the complaints will come from those who are not to fly in the new stuff...and, to be honest, often it’s the same with the maintenance staff too.
Believe me when I say that the new operators will get used to the new aircraft and develop new remedies to replace old processes...and make them work - just like the original awful Tornado became a classic war machine...in the end.
Flying old aircraft is not a great idea in a military environment and to update the old things to ‘new’ technologies would cost the same or more as a new aircraft. These new aircraft will prove more reliable even than the redoubtable Huey, and certainly be cost effective if you fly each of them less than 7 hours a day...from my experience.