I'm going to repeat myself but please support yubikey feature. IT's pretty simple, yubikco is giving all the API we need to do this:
We know that it should be for web app but if you say was the ONLY usecase then
-> we wouldn't use it to auth in windows 7 locally
-> we wouldn't use it to auth in keepass locally
-> we wouldn't use it to auth to QubesOS and decrypt the device LOCALLY
Should I continue?
Yubikey CAN and SHOULD be used to decrypt encrypted assets in ALLL password manager.
We should never pretend to know better since there are always better version of ourselves and in this case it's also true. If theoreticians of security and cryptology use it then we should too. simple as that.