There's another feature that the revamped M1 iMac could have added: Face ID. According to Bloomberg's Mark Gurman in his latest edition of the Power On newsletter, Apple at least considered adding Face ID to the revamped iMac last year. It's been a while since rumors about the Mac getting Face ID started.

Link: Apple reportedly considered Face ID for M1 iMac, future unclear
via 9to5mac.com