It’s the protocol of the brave new world, you and the recipient need a single sentence to communicate but the culture dictates using certain language and politeness + personal flavor so your AI helps you write culturally appropriate fluff and the person who receives it is using their AI to get rid if the fluff so you are both optimized for productivity through stripping the culture away making your interactions faceless and yourself fungible.

You can imagine this spread into dating as well, so you just have sex efficiently to optimize the breeding and hedonism.

At some point the protocol of expanding and then compacting with AI will also be removed to optimize the unneeded inference and people will again talk to each other but using the caveman language, stripped away from centuries of culture.