short answer; data is valuable - a binary referendum gives a paucity of data about exactly how to proceed - which is exactly why we’re in this shit. The more people use available technology to register their opposition/support to specifics the clearer picture we have of how we can build a more inclusive & participatory democracy.
There wasn’t a referendum about prorogueing Parliament. 1.3million people in less than 24hours have voiced their opposition to suspending Parliamentary democracy.
The revoke A50 petition gained 6 million signatures in a week and was wafted away with a cursory non-debate.
The more these things are a matter of public record the more we’re able to scrutinise the current constitutional representative democracy and find it disatisfactory that a paucity of data gets to be interpreted by…
…especially when we have an entire global infrastructure built for collecting detailed data and pretty much anyone can input & participate