OP completely missed the point of toasts. Some user actions can be
1) done accidentally
2) don't lend themselves to confirmation boxes because they are often also done repeatedly
So if you accidentally press something and suddenly the email is gone from your inbox, you want a toast with an undo button. Or if you're just idling and you suddenly see a toast because you were leaning on a button, you'll be glad it's there too. Preferably with a description of what action was performed, and an undo button.
In Gimp when you press Tab, it hides the whole UI with no way to go back if you don't know the shortcut. This is desirable for artists who want a focused view on their image. I can't tell you how much I would've liked a Toast with an "undo" button at that moment when I pressed it accidentally and had to google "gimp how to fix interface disappeared", and if I was computer illiterate I don't even know how I would have reacted.
> So if you accidentally press something and suddenly the email is gone from your inbox, you want a toast with an undo button.
Why? If an email suddenly vanishes and you don't want that you don't need a popup to tell you what happened, you can just Ctrl-Z and the email comes back
No, not for email. Tech illiterate people use email. They're not going to have the reflex to Ctrl+Z, but a toast with "undo" at least gives them the information that undoing is possible, even if they're not quick enough to click on it
1) done accidentally
2) don't lend themselves to confirmation boxes because they are often also done repeatedly
So if you accidentally press something and suddenly the email is gone from your inbox, you want a toast with an undo button. Or if you're just idling and you suddenly see a toast because you were leaning on a button, you'll be glad it's there too. Preferably with a description of what action was performed, and an undo button.
In Gimp when you press Tab, it hides the whole UI with no way to go back if you don't know the shortcut. This is desirable for artists who want a focused view on their image. I can't tell you how much I would've liked a Toast with an "undo" button at that moment when I pressed it accidentally and had to google "gimp how to fix interface disappeared", and if I was computer illiterate I don't even know how I would have reacted.