Interesting feature. I figure it still provides something of a hint if the estimate is updated immediately—e.g. if your opponent plays a move and suddenly you'

Interesting feature. I figure it still provides something of a hint if the estimate is updated immediately—e.g. if your opponent plays a move and suddenly you're several points ahead of where you were, then that's strong evidence that your opponent has let you win a piece, and you should look for a tactical combination to do that. Which isn't necessarily a bad thing, it just changes the game. If we embrace this rule, then I humbly suggest that a large change in evaluation (due to a blunder) be accompanied by an "Oooooooh!" sound effect; that's what semi-restrained human observers might do.