"Scottish independence" is an ideal - the same as "Brexit".
Day one after a vote for independence and the Scottish negotiators would meet with the Rest of UK negotiators, we want this, that and some of that. You can have some on this, all of that but not the other. Yes, no, yes - have some of that.
Did those who voted Brexit get the Brexit they wanted? I doubt it. Would probably independence voters accept whatever was finally negotiated? No, " nasty English stole it from our poor deluded innocents".
If a vote for independence was followed by a "are you in favour if the independence we have negotiated for you before finally adopted?"such as John major proposed after the event for Brexit it would give the people a final choice.
The 2014 referendum was a" once on a lifetime opportunity. It was close. There was and is a lot of support for independence. Who makes the support up- a lot of Professionals and state employees who will not be adversely affected, are needed to run medicine, law and council services. A lot of people relying on the state for financial support, so nothing to lose.
2014 - a close run referendum. So if you were in charge of the losing side whom you go all out to impress the no voters? Entice and reassure investors, businesses, and people likely to set up businesses in the country. No, a ferry building contract years and years late, millions over budget. Criminal tartan todger Isla Bryson with "her" penis clear in "her" leggings going to jail. Countless other foul ups - recycling scheme. Pick the easy one, in use in the US and Canada. No, rely on the supermarkets to buy expensive machinery built at great cost to companies to run on electricity to sort waste. From a green party presumably wanting to cut use of fossil fuels.
A vote against 14 years of the conservatives or a vote against a year and a half of labour by supporting a party who has had a 19 year Reich is not a wise idea.