> Although operating systems have recently introduced APIs [...] for third-party tools to hook into, the experience remains fragmented and lacks the decades of UX polish towards password autofill. Autofill outside the browser and inside native applications remains especially inconsistent.

I disagree. It is just a wrong statement. Passkeys actually eliminate the flaky autofill part where password managers have to parse input fields. Ever since I learnt about KeePassXC and KeePassDx, I've tried to migrate as much of my accounts to passkeys. The experience is wonderful and KeePass allows me to see the private key behind the passkey - yes, yes, yes!