I said they lost their laws and institutions as it is mentioned on the linked wiki page. It is a big deal to them as is clear how they present it in the museum of Catalonia in Barcelona and how big they remember this day every year. They want to be more in control of their own rules and destiny and that fight is still alive.

The question is if this is the majority or a loud minority. But without a proper referendum we will never know exactly. But how they vote in regional elections seem to be that most are more separatist.