Passkeys lock into a specific device and seem easy until you need to use another device.

But instead of being a credential you own and control, across what could even be a local password manager, it's one password to everything. Maybe it is more secure than a regular password in some cases but it largely seems like a worse fix than existing tools for a problem that has better solutions.

On Windows, I hate them. They always push me towards using a PIN instead of my Yubikey or password.

It already falls apart for regular interactions like "Can you send me the Netflix password?"

And Windows, you need Bluetooth enabled on both devices, on Linux you need Chrome (and presumably bluetooth enabled). It makes you scan a QR code.

Already you're off-base. Of course it works when your devices are homogenized, but very little folks work that way. Some people have a Windows computer using Brave, an iPhone using Safari, an Android device using Chrome, and a work computer with its own hardware/software limitations and partitions.

Of course it works when your ecosystems are not diversified. Problem is, most people are.