Although not personally in the market for such a gun, I congratulate the move of W.Evans.
The internals may be the same of other Guerinis, but at least they are using a well tested and reliable source. I would rather have that, than a master piece full of problems.
Sharing some (major) parts is what we all have in cars, computers, home appliances etc ... Why not in guns ?
In no particular order, brand, image, service, warranty and value is what drive us in choosing one over the other, and it's up to the gun makers that we perceive these semi-outsourced guns as good value. Not a small task.

HM