One Step Update now takes Two Steps
When it is necessary to enter the Password Vault password; once the password has been entered {step 1} and the Enter key pressed (or the Enter button clicked) {step 2}, Quicken begins the One Step Update (which works now as it always has - updating multiple accounts at multiple financial institutions after that last click/step that initiates the download with no further involvement with the user - that is, in ONE STEP (as noted in the discussion: the OSU process is a "One Step" update process; NOT a "One Click" update process ... the word "step" applies to the word "update" and has nothing to do with the number of mouse clicks or key strokes).
However, what the two posters in the above linked discussion do not appear to realize is that the Password Vault password is not necessarily required for every One Step Update. Once you have successfully supplied the Password Vault password vault (for any purpose) during a given session of Quicken, you will not need to enter that Vault password again for some length of time (I forget the exact length of time, but I think it is at least an hour, and quite possibly more).
If you did a One Step Update in the current Quicken session (say 15 minutes ago, for example) and you now initiate a second OSU, you will not be asked for the Vault password; Quicken will present you with the One Step Update Settings (as it always has in this situation) so you can make any necessary adjustments to the OSU before it begins (*).
You can also add and edit passwords in the Password Vault without having to supply the Vault password if you entered the Vault password recently enough in your current Quicken session (you will, however, still be required to enter the Vault password every time you want to Print the Vault). (**)
And contrary to the bogus claim in the above discussion, by not having to enter the Password Vault password, you are actually saving keystrokes - no need to key any password characters, and no need to click or press Enter. Seems like it ought to be obvious that is a simpler process than having to provide the Vault password.
[ (*) Since older versions of Quicken can no longer do One Step Updates, there is no way to test those older versions. But I have the most current Quicken release (R28.24) on one PC, release R16.17 (12 releases earlier than R28.24) installed on another PC: both Quicken releases work as I have described above. There has been no recent change to Quicken as suggested by the original poster in the above linked discussion.]
[ (**) Regarding those versions of Quicken that are too old to do One Step Updates: I have tested in Q2017 R20.5, and I am able to open the Password Vault there without entering the Vault password, when I have previously entered the Vault password during the same Quicken session. So that part of the process works the same as the most current Quicken (Q2020 R28.24).]