Thanks for the welcome folks! And I'd be happy to expand more shortly Vort, I just want to get some thoughts on a thing or two before I jump too deeply into a concept is all!
So the big one I have at present is about a focus. Thinking about a focus in Spirit Magic, and wanted to gauge reaction on what it would cover. By RAW, a minor would cover the ReVi guidelines that involve summoning/commanding/warding against spirits. Well, that and if I were to bind a spirit as a familiar using ReVi.
So then the question becomes, what if I try to make it a major? Would that cover summoning spell spirits from Hermetic Theurgy? While it's arguably far less broad than plenty of the majors listed in the core rules, the biggest complaint I could see is that it could in theory, cover a ton of other guidelines from just that "one". On the flip side, there's the fact that you would still need the arts in question, and are subject to the significant restrictions that come along with spell spirits (extremely limited pen, taking twice as long to cast, no rituals, etc). Honestly, you'd probably be better off finding a spirit capable of casting and or sponting what you want and binding them into service with ReVi instead of bothering with a spell spirit, but I digress.
Again, just trying to be upfront and having any necessary discourse with the troupe before diving too deep. Better to do it now and prevent any hard feelings from anyone after the fact, ya know?