Google's advanced security is a good example of an actual implementation of fido2 where they've had to deal with real world threats and device usage. They require multiple fido2 devices (for dealing with the lost/damaged problems).
Compromise of FIDO2 devices is particularly interesting though. Specialized hardware like a yubikey rather than software based fido2 might help here, but that still leaves theft as a wide open vector. If theft is a risk for your use case, https://www.yubico.com/blog/getting-a-biometric-security-key... could be an interesting solution or using secure hardware on your phone behind a lockscreen. Also having a password (in addition to webauthn) might be good enough for you to slow down an attacker enough for you to disable your compromised device (using another fido2 device to authenticate).
Compromise of FIDO2 devices is particularly interesting though. Specialized hardware like a yubikey rather than software based fido2 might help here, but that still leaves theft as a wide open vector. If theft is a risk for your use case, https://www.yubico.com/blog/getting-a-biometric-security-key... could be an interesting solution or using secure hardware on your phone behind a lockscreen. Also having a password (in addition to webauthn) might be good enough for you to slow down an attacker enough for you to disable your compromised device (using another fido2 device to authenticate).