Basically all of these are examples of 'bad UX is bad UX'. Sure, don't show a toast when another confirmation already appears. And dont make them async to appear. And dont include undo for something that is able to be easily undone. The toast for archive with the 'undo' _is specifically when you should be using this_.
For context, I'm coming from the world of native apps. Toasts overall, especially with the 'undo' action, have been a very useful contribution by Google to UX. Compared to iOS's "show a blocking popup in the middle of the screen", they were so much nicer. Like I said, the "undo" for cases like the archive example are the whole point! Instead of asking "are you sure?" for everything, you just delay the action and offer an undo. Default to the user being sure they wanted to perform that action and dont gatekeep their flow. Dont overuse it, but dont blame its bad uses on the toast itself.
For context, I'm coming from the world of native apps. Toasts overall, especially with the 'undo' action, have been a very useful contribution by Google to UX. Compared to iOS's "show a blocking popup in the middle of the screen", they were so much nicer. Like I said, the "undo" for cases like the archive example are the whole point! Instead of asking "are you sure?" for everything, you just delay the action and offer an undo. Default to the user being sure they wanted to perform that action and dont gatekeep their flow. Dont overuse it, but dont blame its bad uses on the toast itself.