Should the US have a mail-in ballot process for whole states in local, state, and federal elections?

In the U.S. mail-in voting is a form of voting in which a ballot is mailed to the home of a registered voter who fills it out and returns it by postal mail or drops it off in-person at a voting center. Five U.S. states routinely conduct all-mail elections: Colorado, Hawaii, Oregon, Washington and Utah. In response to the Covid-19 pandemic four additional states—California, Nevada, New Jersey and Vermont—and the District of Columbia have pledged to mail out ballots to all properly registered voters for the November 2020 election.