Well, it also depends...Asheville spoilers ahoy:
I have a major villain who is an almost council-level talent. He has the Sight, he has Wizard's Constitution, and has pushed himself into monster-level negative refresh with Refinement. For whatever reason though he has a mental block that prevents him from doing Evocation. He doesn't even have Channeling. He just can't do fast-twitch magic.
As such, he's shored up his weakness by crafting a lot of single or limited use enchanted items or potions. He has a pipe that can produce a thick smoke screen for escapes, a mojo bag sewn into his tweed jacket that gives him three uses of armor, and a few satchels of Graveyard Dirt that can act as a powerful attack (8 shifts of damage due to Lore, Aspect, Lawbreaker, and a Strength focus), and maybe some others if I'm feeling nasty.
For him, focus items are certainly useful and he has one (a hoodoo bible) to aid in his summoning efforts, but he's basically using enchanted items to shore up his major weakness. I may be wrong, but in the case of a spellcaster without Channeling, I think enchanted items are more useful