By definition you will have access to things Apple wont publish or support at subsidized rates below the fully loaded hourly cost of a senior engineer.
Because you will be paying the full unsubsidized rate for any support needed for features not available to the mass market.
Its like how IBM will gladly send a team of senior engineers to help enterprise clients resolve every last possible request.
Edit: As compared to mass market features, where the economics dont work unless they’re close to 100% certain most users wont require any costly support.
Would the following be possible, in principle?
Apple Enterprise Developer account requires 100 employees minimum, but Apple Enterprise does not.