Here’s one of the sources cited by that Wikipedia article:
Mostly-Mail Elections (aka Vote-by-Mail, All-Mail or Vote-at-Home Elections) What Are Mostly-Mail Elections? In mostly-mail elections, all registered voters are sent a ballot through the mail. The voter marks the ballot, puts it in a secrecy sleeve or envelope if required, places it in a separate mailing envelope, signs an affidavit on the exterior of the mailing envelope or otherwise provides verification of their identify and then returns the ballot via mail or by dropping it off at an approved return location.
Ballots are mailed out well ahead of Election Day, and thus voters have an “election period,” not just a single day, to vote. Mostly-mail elections can be thought of as absentee voting for everyone. This system is also referred to as “vote-by-mail” or all-mail ballot elections. While “mostly-mail elections” means that every registered voter receives a ballot by mail, this does not preclude in-person voting opportunities on or before Election Day. For example, even though all registered voters in Colorado are mailed a ballot, voters can choose instead to cast a ballot at an in-person vote center during the early voting period or on Election Day.
According to this, “All mail elections” are not different from “mostly mail” elections, and doesn’t preclude the use of in person voting.
Also
systems should make doing the wrong thing impossible
Please no, imo that’s an incredibly fucked line of reasoning