are you going to answer the question?
The question you are actually asking is -- Would I support Biden following the European policy of closing our borders (air-travel) from countries with high levels of Covid for periods of time in order to protect American society.
I also believe -- at this point -- all adult travelers coming to the U.S. via air should be vaccinated -- as well as Covid tests being required prior entry.
We should note that Biden has already closed our borders for periods of time -- including land borders. One example is not allowing Canadians to travel to the U.S.
The Trump method of "closing" the borders where tens of thousands of travelers came from China & Europe with no testing and no quarantines in 2020 -- was ridiculous. Trump's "border closings" did not make us safer or stop Covid from being imported into the U.S. If you are going to allow citizens/residents to return to the U.S. in 2020 then the policy should have been a requirement to be tested prior travel and 14 day quarantine after travel -- like many other countries did.