Joining criteria are (https://ec.europa.eu/neighbourhood-enlargement/enlargement-p...):
* stable institutions guaranteeing democracy, the rule of law, human rights and respect for and protection of minorities;
* a functioning market economy and the capacity to cope with competition and market forces in the EU;
* the ability to take on and implement effectively the obligations of membership, including adherence to the aims of political, economic and monetary union.
How could it be judged that institutions are stable immediately after independence? There'd be a ton of new ones that would need to be set up.
Most of these are institutions are based physically in rUK so it’s not like they can be “split”
Its population of around 5 million is comparable to other small EU member states such as Ireland, Slovakia, Finland, and Croatia[2].
[0] - https://www.gov.scot/binaries/content/documents/govscot/publ...
[1] - https://ec.europa.eu/eurostat/databrowser/view/sdg_08_10/def...
[2] - https://ec.europa.eu/eurostat/databrowser/view/tps00001/defa...
This idea that Scotland is going to vote for independence from the UK and straight into Europe is far fetched.