1Password not prompting to save new Login/Registration???

RSBC I agree with you that "you do not want your browser posting anything temporary to a foreign server."

Just want to clarify two things:
1. "onus" is still on the user as it should be. When you say this, you mean the user has the responsibility to take care of their password, which I agree. The "onus" I meant was for initiating the prompt. The post-login is for the user to review, and the pre-login is for the user to initiate. It is totally different.
2. I meant to "temporary store" locally not to 1Password's server (the same as the post-login mechanism; I am not saying implementation-wise it is the same). Indeed, it may still pose a risk as you said "You do not want any software recording your password as you type it!" Then, there could be better solutions.

In summary, 1 is about the customer experience. and pre-login is bad for at least many (including me, and many people replied in this thread). 2 is about technical solutions, what I threw there was just a random initial idea. How to develop a solution even better than the existing post-login mechanism is a problem for 1Password team to solve.