It's worth noting that the reason why your OS/distro doesn't have or doesn't respect wheel is largely down to RMS opposing it[0], instead favoring people trading the root password around to unauthorized users.
It's also worth noting that the Coreutils `su` is no longer in use by anyone, and that the `su` from the shadow-package absolutely checks for wheel. It's even configurable if you haven't enabled PAM by configuring `SU_WHEEL_ONLY` in your login.defs. And with PAM you configure that via PAM.
Hell, not even GNU distros like GNU Guix, Parabola, nor Trisquel follow RMS' opinions on this anymore.
Hell, not even GNU distros like GNU Guix, Parabola, nor Trisquel follow RMS' opinions on this anymore.