Watching the video I'm already lost. Why would I want a "fresh start" with a new email? All the people I talk to and services I use already know my email. Also

Watching the video I'm already lost. Why would I want a "fresh start" with a new email? All the people I talk to and services I use already know my email. Also, why would I want to see emails that I've already seen right on the main page? I already saw it. I originally hoped maybe this was for "snoozed" things, but it seems like snoozed things go... below stuff I didn't snooze? The focus mode looks interesting, but what I'd want is focus mode on the email address I've been using for the last 20 years.