The Finder already handles this differently for file copy operations - you don't get a file copy progress dialog if it takes less time than you need to react (just an audio confirmation). It seems like Archive Utility didn't get that extra attention though.

Maybe it's a minor security feature. Unzipping something in the background might be something they want to always call attention to.

Maybe a new type of dialog could help? Rather than showing this blinking things, just show a notification of style "24 archives extracted" (kind of like what forklift does)

Then just don't show a dialog.

Then users wonder "Did it actually save?"

So just pop a click-anywhere "Saved!" notification.

Then users will keep clicking on save until that notification comes, when your save takes just a bit longer than usual.

By hypothesis (see https://news.ycombinator.com/item?id=13135385), the operation is effectively instant. If it weren't, a UI on its own thread could notice that and act accordingly.

We were talking about unzipping. If successful, the unzipped contents appear next to the archive.