The concern is manufactured by right wing media. No steps can be taken that will satisfy the right, barring mass disenfranchisement (e.g. throwing out mail-in ballots or forcing a hand-count to gum the works).
It's extremely hard to certify chain of custody and validate mail-in ballots. It would require forensic analysis of the ballot, looking at the signature for example, and that is not feasible or realistic to do, even after elections. In other words, mail-in ballots are already making elections a lot less trustworthy, and I'm sure if it benefited Republicans, it would be Democrats who would be opening those court cases and fighting it as much as possible.
Saying this concern is manufactured by the media is itself a kind of conspiracy theory, because I remember clearly that mail-in ballots were a huge concern even before 2020 elections. Granted, there were a lot of cases thrown out, and it's hard to find evidence, but that doesn't invalidate the concerns. My point is that we need elections that do not allow for these kinds of doubts in the first place.
