To be honest I find the things I do on my "work" laptop are different to the things I do on my "personal" laptop, and different again to what I do on my desktop machine.

Regardless of which machine I'm using at any given moment I appreciate having "endless history", and the ability to search/filter it. But despite that I don't think I need to actual sync that.

I'm sure there is value to be had from syncing and making all history unified, but it's never appealed to me particularly.