> So what? Also do Galicia, País Vasco, and many other regions and parts of Spain.
A complete list would include the Basques, many of whom would be happy to secede. We aren't talking about complete consensus and universally held beliefs.
> But this is not related to secession at all.
The idea that cultural differences - like language, but there are definitely others - are unrelated to a desire for secession, and it's all about wealth, which is what you asserted, is crazy. Plenty of secession movements move forward even though they are clearly financially self-defeating for the parties involved. (in my part of the world it's sometimes about Quebec...)
I don't have a dog in the fight but it's bothersome that you're trying to erase the reasons they are giving for wanting to secede. It's not helping anybody.