Anything worth doing with magic generally has a ridiculously high finesse factor - especially if you are duplicating mundane work with magic. I have proposed to my SG that if I am using magic to do something, I can use an applicable craft score to help with the ease factor.
The premise for this is that I could do it with my own hands, therefore I have a better understanding of how it all should work together. This should be especially true for the rego craft spells in covenants.
I have also discussed an offshoot of this with him, using craft scores when creating spells. If I have Craft Blacksmith (swords) 4, and I design a CrTe spell to create a sword, my craft ability could be written into the spell so that anyone casting my version of the spell would gain a +4 bonus to creating a better type of sword.
This sort of working encourages magi to gain practical skills, and allows for more themed spells. It helps to differentiate between lab-texts for the same spell written by different people. I think it helps to create stories by people searching for mythical spells with a +8 bonus for creating XXXXXX. It could also encourage other magi to take in Forge Companions instead of just verditius (adding their (craft score / 5) rounded up).
Does anyone else agree, or do they see it as diminishing finesse, or as misunderstanding what finesse is all about?