More importantly, the code signing is a security measure. You can in theory vet the signature database by hand preventing the execution of unapproved drivers.
Microsoft normally puts it in revocation mode only, with bad drivers with unfixed holes being blocked.
Added links to answer, they tell that drivers must be signed and tested by microsoft, the WHQL is part of that. Ability to do other way deprecated in 2021.
I guarantee you Apple will take zero responsibility for a failing or issue with third party software, notwithstanding the purported difference between notarized and signed.