I'm inclined to suggest that perception of risk is rather a personal thing. Why do we do anything, when often doing nothing is less risky - be that flying, rock climbing, crossing the road... or changing fuel tanks in flight? Presumably because we think the value outweighs the (additional) risk.
Assume it won't restart. *Personally* I'm of the opinion that a permanent loss of power *over a decent airfield* ought to be a complete non-event - which was why I wanted to clarify we weren't talking about a simulated off field landing. Frankly, I'm probably more worried that the fuel selector will fall off in my hand changing tanks at an inopportune moment. I'm also very glad I've experienced a true power out approach and landing, (right down to the roll out) - I found it a markedly different experience to a 'simulated' one, though I suspect that might be 90% psychological. I was surprised how much time I had to fluff around early on at height, and how quickly it all came up after turning final.
I wouldn't make it standard procedure, but for me there was definitely a value. Not sure it would have been as worthwhile if we'd re-lit and gone around.