All of those are integrated with, or use wider UK infrastructure/businesses. There’s no way of neatly dividing any of it and in the case of negotiations, each party will do what’s best for itself. Just like EU and UK.

Plus it’s really not a given that the EU would let Scotland in. Several EU countries with autonomous regions may not like that for obvious reasons.

Brexit hasn’t been a disaster because the EU was ‘shitty’ to us. Severing ties with your closest economic and political partners was never going to end well.

Scoxit would be at least as dumb as Brexit, for many of the same reasons