If the point of this post was to vent your frustrations, they you’ve achieved your goal. If however, your goal is to solve this problem that you’ve implied is widespread, you’ll have to dig in with a bit more effort. To answer your question, resolving this problem will require you take charge and not passively wait for a magic fix.
Provide some details about how your Z-wave integration is configured to use your Z-wave controller - what is the hardware path configured?
Did you confirm that path is still valid after the reboot? Many of these problems wind up as the hardware is not at the path or the hardware itself needs a hard reset.
Did you unplug the controller and reset it?
What are the errors in the Home Assistant log for the Z-wave integration failure?
Personally I run the Z-wave JS UI Add-on and not the core Z-wave integration. It provides its own UI and logs that make troubleshooting Z-wave easier. It’s the same software HomeSeer has decided to migrate to.