There may still be a few routines that expect C-ordered arrays and so require a copy be made when given a Fortran-ordered array --- especially as you extend to

There may still be a few routines that expect C-ordered arrays and so require a copy be made when given a Fortran-ordered array --- especially as you extend to one of libraries that use NumPy. For the most, part, however, Fortran-ordered arrays should work well. It all comes down to the expectation of the routine writer.