Why not? There are lots of great things in the world that are easy and a joy to use, but fairly challenging to learn the technical details of. The electricity grid, airplanes, microwave ovens, you name it. Tons of straightforward user experiences that take some work to understand.
One counter point though is that... if there is a new lifesaving technology, and even the somewhat IT literate / somewhat geeky / folks who WANT to understand it, are struggling... it may not be as simple and easy and safe. If I ask "how do I backup my passwords", I'll have 10 million folks answer "use a password manager, backup the file". When I ask similar questions with passkeys, the breadth,inconsistency and complexity of answers is as insightful as it is worrisome.
"Does that mean that passkeys can't be shared between users or devices?" is a 100% reasonable question.
"Passkeys are a step backward because they can't be shared between users or devices" is not really a question, it's an opinion based on imagination.
And passwords are just as complex. How do you securely share a login with another user?
Yes, there's complexity, but it's complexity born of a change in paradigm. The actual new thing is either equally simple or simpler than traditional passwords, once you factor in scenarios like backup, transfer, multi-device sync, sharing, etc. It's just different.