HTTP is specified in the RFC. Only the developer certificate is checked. OCSP is also used by web browsers to check the revocation status of certificates used for HTTPS connections. Apple leveraged OCSP for its Gatekeeper functionality. This is not the same thing as notarization, which is checked over HTTPS.
https://blog.jacopo.io/en/post/apple-ocsp/
Perhaps you should learn about OCSP before complaining about its use of HTTP.