Sure, we could increase benefits but with that we'd have to increase taxes to fund it somehow.
We could also be a small nobody country with no defence. Of course if we increased our strength we'd also have to take that money from somewhere.
Like it or not we rely quite a lot on our connection to the USA and other countries. Without helping with foreign policy we'd lose a lot of our friends.
Which the NHS have said they couldn't cope without. Of course, we could offer more funding to the NHS. However the point is we can't spend money everywhere with nowhere to take it from.
If the SNP were to follow through on half their policies, which they wouldn't, we'd die of debt.
So rather than having an, admittedly pretty **** BBC, we'd have an even ****ter equivalent where half the shows would probably be in gaelic.