I too use (multiple) yubikey to hold my private gpg keys.

But I am not sure I will stick with gpg though.

Even with my system to extend their expiration or renew them. I have found handling them to be a pain.

I use them for 2 things: encrypt/decrypt gopass secrets and sign git commits.

Gopass now has more than decent age support. A yubikey can hold an age key.

Most git forges accept a ssh key to sign commits. A yubikey can hold a ssh key.

So, for my needs, I think I could leave the operational complexities (to me) of gpg and go for alternatives that are simpler.