That's the main thing I wish was done better. There was barely any actual lead up from the perspective of an average person. Just a new unfamiliar flow on half of the login screens that they use.
Sure, its explained. But not in a satisfactory way that would reach all users at their level.
This is a bit of an exaggeration and out of proportion, but I think my ideal would be one of the big tech companies should have bought out something like a super bowl ad. Something that actually conveys the idea "hey, we know you've used passwords since you were able to type on a keyboard, but here's new technology that's better and here's why" in plain language that the average person can understand.
Unfortunately, XKCD 2501 continues to be relevant. [1]