What implicit research phase?
In the narrative fiction behind creating a ritual, I feel that usually there is some research involved about how to go about something. I meant implicit (implied) as opposed to explicit, because research isn't explicitly mentioned in Thaumaturgy (but it is implied by the entries I mentioned earlier about workspaces and their uses). It could be an error of omission, or an item that wasn't cut from the final product, but wither way, there is a tiny little conflict in the rules between those two items, and it falls down to (what I feel is) an implied research component to Thaumaturgy.
A whole adventure just to get permission to spend extra time on a difficulty 6 roll?
Wouldn't it be easier just to spend a Fate Point or three to succeed at knowing off-hand?
Gotta have the Fate Points to do that, but it is certainly a good point. That said, the RAW indicate that the quality of your library/workspace/etc. represents the top difficulty of the problem you can solve at your library/workspace/etc., so having a +3 library but needing to answer a +6 question wouldn't be helped by additional time: the +6 question is narratively outside of the permissions given by the +3 library.
All of this, of course, is if you bother to use those rules.