Even if the malware hijacks your session tokens, using something like WebAuthn prevents silent theft of a password, which is much more powerful (allows creation of new sessions).
If your host is infected with malware but it can't steal your passwords due to hardware boundaries, it still has access to your host at a pretty reasonable permission level.
In most corporate environments that's far more damaging than getting persistence in a handful of webapps.
In most corporate environments that's far more damaging than getting persistence in a handful of webapps.
Also, 2FA solves this exact issue.