Earlier quoted context omitted.
A reminder here that it varies MASSIVELY state by state. Some states definitely are NOT for increasing participation and enfranchising as many people as possible and plenty of states have way more in regards to hiding your vote from the poll workers
But if you want to participate more in the elections than just R vs D, say, decide which candidate R or D should elect, then you land in a public registry, no?
Dropping a mail-in ballot in person seemed to have no plausible subreptitious election integrity attack I could think of though.