It feels so amazingly depressing for so much sunk knowledge to just go away and be worthless. Feels like I could have learned so many more things that I could h

It feels so amazingly depressing for so much sunk knowledge to just go away and be worthless. Feels like I could have learned so many more things that I could have had gotten joy out of today and still extract useful things out of, or build things on top of, long into the future if I'd just focus on the time-invariants of knowledge space.