I agree, I think this is an advantage. It also (for people who actually pay attention - which unfortunately isn't that many) allows stark contrasts of different approaches so we can see which methods work better than others.
The downside is our influence on the world stage. World leaders are more hesitant to get into bed with us if our policies are changing materially from administration to administration. It used to be that R and D administrations followed regular policy, and had slight differences at the social level. Not anymore.
There was a time when politics stopped at the water’s edge. Hopefully we can get back to that.