Hi!
Hello to you good sir.
How are you doing today.
I'm fine.
You get: I'm fine.
How are you today?
Hello to you good sir.
Hi!
...and you lose the navigation state, so it's impossible to tell where you were at last on Twitter except by memory.
We spent the last 25 years of computer history teaching both the users and the computers how to multitask, only for the most recent user designers to try their damnedest to take it away from us.