Upcoming improvements to the Azure AD sign-in experience

So, I thought this was just an update to the look?

With the new 'preview' UI I am constantly challenged to log on (again and again and again and ...) to O365 (web site) and MS apps, and presented ONLY with my Windows login name.
I go to the O365 web page and see my O365 account. "Hello, Welcome Back funky dude" it welcomes while presenting my O365 account and a Sign In button. I click.
Then :-(
The UI presents two options for me to sign in with my windows account and one with my Windows email address. Where is my O365 sign in option. So, then I click and have to key it in to a blank dialogue box (my O365 name is not remembered in spite of being input 2 trillion times! And in spite of it being in the 'Work of School' field of my Windows account).

I'm sorry for sounding furious, it's just because I am so furious. The whole sign in technology has been so broken for years. It's becoming quite intolerable. With MS O365 and Azure I spend more time signing in than doing any other one thing. Seriously! Someone has to see the irony in calling this 'productivity' software. Surely?