Strong disagree. Getting versioned data/undo nearly for free was a huge huge huge boon. Getting stupid fast has-changed checks is the bread & butter. We spent

Strong disagree. Getting versioned data/undo nearly for free was a huge huge huge boon. Getting stupid fast has-changed checks is the bread & butter. We spent a while trying to move from an admittedly terrible Redux implementation with lots of fine immutable usage, to graphql. It has been a disaster. Immutable in particular we have found has been hugely responsible for keeping things fast; it's been a pillar holding up our world. The ability to cache fine grained intermediary results has been epic. It's almost impossible to imagine what else would give us this. We'd need, like, very fine grained signals, that can deal with data being inserted/chmaged/removed from collections.