My own opinion FWIW .... You don't necessarily need "extra" skills for
sail, versus power, as much as you need "different" skills.
For many, the skills you need for sail, are less familiar on a daily
basis than the skills you need for power, so are more easily picked up
when handling a power boat.
Many will differ with this assessment, and that's OK. because in the end
you may realize that it's going to be up to you to decides as to which
is best for you.

otn