Prince George's future is all laid out, he has zero incentive and zero opportunity to make something worthwhile by himself. He will never be "just another one of the team", at least, not for long.
I wouldn't wish Prince George's life for my sons.
Being a part of military actually should be seen as a limitation rather than William going his own way. Since the soldiers pledge their loyalty to the crown it is deemed appropriate that a potential future monarch should serve in the military. They get to choose which bit, and perhaps when, but they probably never had a choice about joining up. Then the Royals only tend to spend a couple of years. Harry is the keenest as he joined infantry. But his fame brought him back from action early because he was a prized target.
Also Wikipedia now says Harry's now in project management: "On 17 January 2014, the Ministry of Defence announced that Harry had completed his attachment to 3 Regiment Army Air Corps and will take up a staff officer role at the position of SO3 (Defence Engagement) in HQ London District. His responsibilities will include helping to co-ordinate significant projects and commemorative events involving the Army in London."
I would expect this is not what he would have chosen had he been born Harry Smith.
The quote that stands out from the episode, "It has occurred to me recently that I have never chosen anything. I was born into a role that was prepared for me. I did everything I was asked to do because it never occurred to me to choose otherwise. And now, at the end of my life, I wonder what might have been. "