we have 'best win info' in all forms of chess then we should also have "worst loss info" as well. This will tell us a lot about the weakness of a player as well.

Here is a loss repeated more than once.

if a player has the "best win" wouldn't that be the "worst loss" for the opponent"?:D LOL

No, not really. The best win for one opponent would very probably not be the worse loss for the other player. It is all subjective anyway

I was over the moon the first time I got the 2 move mate on someone, but it was my stepson and he plays like a fish.  In a way it was my best win as I had wanted to do that to someone for years.