Scottish independence is a bad idea for many of the same reasons that Brexit was a bad idea and Brexit has made Scottish independence into a much worse idea. Instead of being like the Czechoslovak break-up it would be more like the issues around the Northern Irish border.

Having a huge land border which is an EU/non-EU border with customs controls would be massive economic disruption on both sides of the border. The damage to people's jobs and lives would be huge. This border has been open since 1707 and people have based their lives and livelihoods around being able to cross it freely with goods and services. I can see the romantic appeal of an independent Scotland, but it would objectively be a disaster.