Nice little erection.
some would say: "it's not the size that matters..."
......yeah, sure

The maintainability of it is far more important than the size.
An epic 10 that fails to maintain its self is a classic flash in the pan story.
that depends on the user... some would rather experience a 10 once than a 3 repeatedly...
also maintainability and size can go very well together. why see them as mutually exclusive?
Your argument is a bit like: "a reliable slow car is better than a fast one"
I'd say: "Depends on how fast you wanna drive. And there are reliable fast cars, as well"
If maintainability comes first (pun intended)
The 10 is better for those that can fit it.
But if the 10 fails constantly it turns into a pain in the ass. ( that pun was for bob)
You are correct in that a perfectly maintainable three would be a drag.
I was going with the idea that most adult males fall in the five to seven zone.
Given the choice of same size you have now, but perfectly maintainable always works and delivers the goods if is far better than a ten that fails more than 50%