Someone may be able to point out to me that this feature already exists in one way or another but I haven't been able to find it so far - Photoshop or Forums.
So, Photoshop recently introduced the ability to change the state of a layer comp within a smart object in the Properties menu, without opening that object. This is an amazing feature.
I thought that logically, there would also now be a preference to 'Remember Smart Object Layer Comp' within the Layer Comp preferences of the main document in the same way that it can remember the visibility and position of any element.
I can only imagine how tidy my Photoshop work space would become if this were the case.