Easy answer. It's a built in history.

I use bash history all the time, I use my browser history all the time.

To be able to use an OS history would be amazing.

What was the name of the esoteric software i was using to program my lego robot,

What was I working on last Thursday so I can fill out the government required SHRED report to get the Canadian RnD tax rebate.

What was the song i was listening to that Spotify played last Tuesday afternoon.

There are so many times i'd use a feature like this.