> It also has the benefits of allowing voters who in absentee vote early for a candidate that later drops out (i.e. Washington State voters who voted for Elizabeth Warren) to correct their vote based on this new information.

Maybe for a primary it's a useful feature but there are simpler options like ranked choice that could be used to do that. Though there are still uses for votes to people who are out of the race because it gives them voting power at the convention if there's not a decisive winner.

Also if we're letting things change that much primaries are never really over in a state. One of the reason for sequential primaries is that it lets smaller campaigns have a chance because they don't have to compete everywhere at once.