Scottish nationalists ironically accuse the UK government of being the arbiters of populist and national sentiment, despite the SNP advocating for the breakup of Britain.
Despite leaving the EU, Britain is positioning itself as a bastion of internationalism. Already more diverse than Scotland, England and the rest of the UK will continue to be participants in European and global politics, albeit, without being a member of the EU. Scotland would benefit from creating policies that encourage the diversity and immigration they claim independence would bring. As it stands, England and Wales has 6 percent more immigrants in its population.
Additionally, England and Wales have a more substantial proportion of minority ethnicities than Scotland.
Being a member of the UK is not a barrier to the goals Scotland hopes to achieve. With a devolved parliament, it may create policies to attract more immigrants and investment. Even with the freedom of movement granted by EU membership, Scotland failed to attract the same rate of immigration as their neighbors to the south. This failure indicates that the UK was no barrier to Scotland's supposed goals.
Lastly, Scotland has many different options to achieve its goals as a nation. They could make a more durable case for more devolved powers or financial independence, but, instead, they pursue an impractical policy of independence that does not inherently achieve any of their set upon goals.