When I use my Mak the largest exit pupil is 1mm. Occasionally I'll go 2mm, but I usually stay below 1mm. The fun (i.e. pushing the Mak's capabilities) starts at 0.5mm.
Seeing galaxies requires mostly aperture and not a lot of precision. A silvered bath tub will show faint galaxies.
(exaggerated to make a point, of course)
(disclaimer above included for people who are easily offended
)
(smiley included for people who lack a sense of humour)
Cheers
Steffen.