Fractional CS seats

I was recently thinking about the concept of a fractional CSM as a way for smaller companies to implement a CS structure on a tighter budget.

As a CS organization grows more nuanced seats are added and I wondered if smaller companies would want something like a "fractional Head of Implementation" or something like that.

One concern I could think of is allowing these people to have access to sensitive data, but otherwise, I'm not sure of the downside.

Anybody have any thoughts?