I think that having a strong public domain is good for everyone. For instance properties like Sherlock Holmes really took off once it was in the public domain and people could write spin-offs and whatnot without worry that a copyright lawyer would come along and sue them.
Linux is the same thing, Amazon using the kernel and stuff to build an OS on doesn’t take anything away from anyone else who uses Linux as a desktop or server environment, and in fact can lead to some good pass back, even if it is just that the devices are easier to root. Take a look at the Open-wrt project, where Linksys built their router on top of a Linux kernel and it led to a whole ecosystem of open routers. People went out of their way to buy a WRT-42G just with the intent of rooting it, and Linksys got their money either way.
You have a point that it will be hard to explain this to everyone on why it is better.
From my understanding, when you use a password manager, the user will enter a pw into it that they remember and the vault will unlock. Then when they go to log into a website, a different, longer, and impossible to remember password will be sent to the site at login. (Assuming they are using the manager well). A week later when they go to log in again, the same long password will be delivered.
The problem is that if a bad actor gets involved, whether it is the website is attacked or they send the user a phishing url or something and the password from the manager is exposed, it will have to be changed. That scammer can now log into that website as the user whenever they want, and possibly any other website that user used the same password for. Hopefully they didn’t if they are using a manager.
With passkeys, a user will log into their manager with a password they remember, but when they go to log into a website, a different token will be sent, based on their key, every time. So if a scammer is listening at the router they still can’t log in again because it has expired.
It is still not a perfect thing, I would imagine that phishing sites could still get a scammer in, who could possibly do bad things or change the login credentials but it is still much more secure than sending a password to the site for the user.