it really depends on the manufacturer IME ... you won't be flipping your RGW, Lull, or Sadowsky nut since they are all cut for a properly detailed low action set-up
I always plan on cutting a new nut if for no other reason than you can't be guaranteed to get the original out without damage (sometimes you get lucky
sometimes you don't
) and the nut blank itself is cheap (under $6US) so why spend time fixing up a nut when it's not much additional time to do one right from a fresh blank
the OP did note this is a Fender, and these are notorious for nuts that require additional work to get them detailed prior to playing. an out of the box Fender will typically have slight intonation issues at the first and second fret due to the factory installed nut being cut too high
a replacement nut requires a lot of skilled work, even if it's one of those awful pre-cut types sold the help save bench time. it's also really easy to mess up a nut ... so if you're ordering blanks, be sure to get 3-5 of them. the shipping will be the same either way, and if you don't mess one up you'll have extras for the future
all the best,
R