Look, this is not a matter of opinion.
The book doesn't say that you can make items with Evocation.
I'm afraid I still disagree with your opinion on what this, given that it is stated as part of the power description for Evocation, etc. This argument strikes me as exactly the same as the following:
(A) I use my
Footwork stunt to use my Fists as defense against his punch.
(B) Sorry, you can't do that. The rules say Athletics is used for defending.
(A) Yes, but it says right there under Footwork that I can substitue Fists!
(B) Sorry, the rules clearly say that dodging attacks is a function of Athletics.
It implies it pretty heavily, but it also implies the opposite by saying that Crafting is a form of Thaumaturgy.
Yes, for purposes of specializations.
You're making good arguments, but good arguments would not be necessary if there was a statement saying you could make items with Thaumaturgy. Which there isn't.
I disagree again. It states under the Thaum/Crafting rules that Crafting is governed by use of stunts. This is
different than every other Thaum specialization.
PS: As I've said before, templates are not a good way to balance things. That approach turns the rules into a minefield for people not using the canon templates. If you want it to be impossible to take Refinement without other spellcasting powers, make it so. Don't try to be sneaky about it.
While I think that templates
are a good way of packaging power requirements and options that make sense for a given character concept, I'm not opposed to the rest of this comment at all. That said, it is
technically a house rule (though a good one) to declare requirements to Refinement, whereas its
not a house rule to insist of vetting of custom templates and ensuring that powers taken fit with template and high concept. So it depends on your group tolerance for house rules or preferences against them.
PPS: Iago's quote actually says that he would partially allow foci and probably wouldn't allow enchanted items. I raise this not because I think his opinion is particularly important, but because I think that the ambiguous nature of his response shows that looking for certainty in what he wrote is foolish.
Ambiguous? He states that the rules say that Evocation/Channeling grants focus items, therefore they can have focus items. I see no ambiguity in that quote whatsoever, and it's basically the same statement I made.
I do find it odd that he later suggests that Enchanted Items are a much more borderline case, since those same rules state (under Evocation/Channeling) that you may swap those focus slots for enchanted item slots. (Though I agree with his suggested limitation that Enchanted Items chosen must fit within the powers known, which would nix the 'standard' Crafter build completely.)