[nomadking]

Whether or not an independent Scotland eventually was able to join the EU, there would have to be a hard border and tariffs, with England, Wales, and NI, and the EU.

If a Scotland-UK agreement was reached, that would block any potential EU agreement, that is unless the premise of the NI backstop situation was totally bogus.
Scotland would lose any access to any trade agreements the UK, has and may come to.
Any advantage Ireland has had from the boom in tech industries, would not be available to Scotland. What is the likelihood of new major Google type industries starting up that could set up in Scotland? Any advantage that there might be for Scotland in that situation, would apply even more so to England, Wales, and NI.