I have a Macbook and an Android phone, as do many people.

Can I still have a seamless experience with passkeys, or have they made that difficult? Do I need to remember to reject the dialog offering to save keys on Keychain and learn to use a 3rd party passkey service?

What am I supposed to about all the passkeys that will be needed at my multiple jobs, which I access from my own Macbook and phone? Can I use a single service, ideally open source, or do I need to use several "passkey sharing & backup managers", one for each entity and one more for my personal keys?

I have a MacBook and an iPhone, so no problems. In your case I guess you need some third party software to achieve what I described.

There is no way I will sync all of my credentials onto other peoples computers.

Trust issues aside, is there a way to get those passkeys out of there?

Suppose you want to switch from iCloud to whatever else, can you export and import those passkeys?

I don't think iCloud has exports for secrets like that (and that's not just restricted to Passkeys).

Other tools do, though, like KeepassXC or any other password manager really.

You can share them via airdrop

No, this is part of the problem. They're using passkeys to build their walled gardens. So lock in is a feature not a bug.

So you're locked into Macs for this seamless experience

I don't know, I just shared my experience with passkeys on a Mac. Maybe Microsoft has something similar.

Yeah I'm on Mac/iPhone as well and was scratching my head at the "multiple passkeys" comment.

>any other device

Any other Apple™ device.