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Passwords have problems, but passkeys have more
(world.hey.com)
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Password managers have only really taken off in the last half-decade, so one-third is kind of to be expected. I know they've been around a long time, but major adoption has been recent.
Passkeys will take a while to get wide adoption as well, especially with syncing problems that we've seen.
Password managers are never going to hit anywhere near 100% adoption rate. It requires knowledge on the part of the user and in many cases money. No grandma isn't going to roll her own with keepass. Most likely she'll never even know what a password manager is. And as long as those users are still out there, admins still have to deal with all the problems they bring.
Incidentally I looked and it's been over a decade since I started using my first password manager. They're not that new.