ostensibly - and I'm in your camp, so this is just devilish advocacy - the idea is that you will be wondering, "who said X to me the other day?" or "what was that article I saw about Y?" and you'll be able to just ask one unified search interface instead of searching in 5 different messengers or poring through your browser history.
I don't know that I need that. Certainly not at the privacy cost involved.
If you use recall, could you explain how? And what solutions does it provide (for you)?