I know you’re being sarcastic but the same people arguing for Scottish Independence were the same ones criticising Brexit for not having a proper plan.
1) The published preparatory papers from the Scottish government at the last indie referendum went far beyond anything Brexit campaigning politicians offered at the EU referendum, and I suspect the same will be true at any future indie referendum.
2) After the EU referendum the Scottish government published papers about their proposed solutions to satisfying the UK wide mandate while minimising the negative effects on Scotland, including “numbers”. The UK gov has spent years now refusing to publish much of their findings, or even look into the effects of, the options the UK faced as it left the EU.
The SNPs and Greens will be ready and transparent come a referendum, there’s no reason to think otherwise.
This whole “look how unprepared the Brexit campaigners were” as an argument for not even having a vote ignores the basic fact that it’s not the same politicians, or even political parties, that are proposing independence. Not all politicians are the same, but of course it’s very much in the interests of certain politicians that we think of things in that way.