YMMV, the machines are very consistent, it takes some serious discipline to match that consistency at home, and you can get color casts accidentally. The C-41 chemicals are also a bit more unfriendly and more difficult to dispose of properly (not sure about positive). So these days I only do non-chromogenic film at home, but I might have made a different choice in the 1990s.
Speaking of which, Kodak doesn't even make E-6 film any more.
Indeed. I've a freezer stuffed with fuji e6 120 and 5x4, and chems for processing.
C41 is a pain in the ass and I only bothered a few times - but with a little practice you can develop positive film perfectly at home - all about being able to work blind, and having a series of tubs at the right temperatures. Admittedly my first few tries ended up with lomo quality from a rollei!
Speaking of which, Kodak doesn't even make E-6 film any more.