Do you mean you want to remove the box and leave the wiring in the ceiling? I believe it’s code in most places that you have to make wire splices like that accessible and not just shoved behind drywall. So, in your case, code would require you to leave it as-is, with the wires capped behind a blank cover plate.
If you REALLY want it gone, you could get into the attic and pull the wires back into a junction box mounted to a rafter or joist. Then, patch the ceiling drywall.
Probably easier to just cap the wires and add a blank cover.
Well, if the interior switch is bad, the device (outlet or otherwise) would never turn on. I’d start by confirming that power is coming into the switch (LINE), and power if leaving the switch in the ON position (LOAD). One of those voltage detectors can do that. If you know the LOAD is good, then use the voltage detector on the suspected lights.
Would a sysadmin really be looking to move away from a Red Hat certification track just because RH behaved like a for-profit corporation? I think it’s naive to assume this will have much of an impact on the reputation and desirability of an RH cert in the business world.
But, I suppose if you just want to avoid giving RH your testing money, then the Linux Foundation certs would be fine.