[ewjordan]

I use several different computers and operating systems regularly, and it's really useful to have my browser history, bookmarks, extensions and other configuration synced up.

That's not to say I'd be miserable without it, but it's a nice convenience that almost immediately upon starting up a new machine, my browser is set up exactly the way I like just logging in.

[amluto]

This illustrates what may be the real problem. Chrome’s sync is a genuinely useful feature. There is no reason at all it needs to be conflated with being signed in to websites.

For that matter, sync is a fantastic use of E2E encryption, and it will be interesting to see if using sync data for any purpose other than syncing it is a GDPR violation.