Spain disintegrates due to its inherent colonial consistency that is still evident in its king. It is a failure of their democracy. Many more European states might face many similar circumstances.
The problem is not that Spain disintegrates. The way solution is not that Catalonia is not Spain. Tibet may not be China or Scotland was not England.
The way Hong Kong aspires for democracy but China fails in accomodating that, what Catalonia would do afresh for Catalans, if independent, is a geopolitical question that nobody bothers to answer.
The colonial consistency must breakdown at some point of time but annihilating all apartheid includes separatism as well. Separatism doesn’t resolve anything. This uploads mere a political hype that fades away with time into coercion of a new kind.