I have more than one account (Work and Personal) and I definitely liked the convenience that before v8 I could use one password to unlock both vaults, but I admit I always thought it'd make more sense to have to unlock each one individually on Windows and so I (believe it or not) actually like that's how it works now (though I'd love if iOS kept FaceID to unlock everything once it's updated).
But from a usability perspective, I'd really appreciate some sort of option to let us unlock more than one vault at a time before the screen closes. If it's already there somehow and I missed it, I apologize. But right now when I login my process looks something like this: I open a browser and use the 1Password extension to unlock, I put in the password for one of my vaults, it unlocks, then since I used the browser the window closes entirely, so I have to open up the app, then I have to go up to the menu and find my other vault and unlock it from there. Granted, if I use the app directly to unlock the window doesn't close, but I have to go find my other vault in the menu first which is still less than ideal.
1Password Version: 8.2.0-56.BETA
Extension Version: 2.0.5 (Beta)
OS Version: Windows 10 21H1