I don't really agree with that one. Certainly, the 2.5 years of
NS, plus another six months' working, before university did help me
a fair bit, in terms of work ethic and a context within which to
apply what I was studying.
On top of that, of my classmates who went all the way from
undergrad through postgrad without interruption, about a third of
them burnt out halfway through their Master's or doctorates.