Daedra can't roam Mundus as freely in the fourth era as they could in the third. When the Amulet of Kings was destroyed and Martin mantled Akatosh, the bridges between Mundus and Oblivion were essentially sealed. Virtually all atronachs (or daedra at all) that we see are either summons or thralls.
Exactly why a Golden Saint roaming the wilderness makes about as much sense as a Flame Atronach roaming the wilderness.
So why one, but not the other?
@Bethesda working oh-so-hard: http://www.iguanadons.net/Unofficial%20Skyrim%20Patch%20Version%20History.html
Explain why we need an unofficial patch if Bethesda isn't lazy. The only time they wish to do work is when it earns them loads of $$$ -- which is fine, considering this is America and $$$ means everything.. but to release a product with such obvious faults, and refuse to fix it even after the community has essentially done most of the work for you, is just plain old
LAZINESS.
Like I said before, we have weapon perks for swords, maces, and axes, but we're only able to bind a one-handed sword or two-handed axe through Conjuration -- please, someone, justify that. Anyone.
You can't. It's just another example of Bethesda being lazy (and short-sighted, but we'll leave that for another day).