Toasts are a great way to lose information. They are a terrible design and should not be used. They distract the user, are not dense with information, and provide no value. If a message is important enough for the user to read, it should be a dialog box.
Most of the time they're used for a quick visual confirmation that "your operation went right"
The information that the user did something "right" should be responsive next to where the user initiated the action- not in a random corner.
That control may not be visible by the time the operation completes.