By "using paper ballots" I understood it to be in-person, voting by mail has a lot of issues indeed.

Usually in person voting is done through a machine. Where as vote by mail is a paper ballet

Only in the united states (where i am not from). Normally i think of paper ballots as the hand counted sort.

However as long as tge machine is just a scanner (still paper trail) much of the same argument spplies.

That sounds ridiculous but I'm sure it works this way in the US. If you can have the worst of both worlds why not make it so.