I've had issues where 1Password wouldn't save my new logins properly, lasting for over a day. Maybe that's why they need the telemetry.

Do 1Password do security/privacy audits the way Mullvad do? That's a pretty decent way of building goodwill over time when it comes to decisions like this. It's probably a fine decision, but they should probably have gone to greater lengths to write this blog post in more exhaustive detail.