> Why would I want a shared clipboard across multiple devices?

I guess you've never had to type something first on your laptop to paste in a phone app, or vice versa.

Or open a link from a phone messaging app in your laptop browser.

In the rare case (maybe once per month or so) where that happens, I start a script on my laptop that starts a webapp both the phone and the laptop can open in their browser and send text to each other.

The overhead of starting it and typing "laptop.tekmol" into the browser on both machines is only a few seconds.

That seems mich saner to me than to constantly have some interaction between the two devices going on.