Deleting all the “things” from your hub shouldn’t be too hard. Might be a bit time consuming because you’d have to bring up each one and delete it. The bigger problem is un-pairing each device. While not terrible hard either, it will be time consuming as you’ll have to look up what the procedure is for each device to un-pair it and maybe have to put your hub into z-wave exclude for each z-wave device.
Part of the thinking here is that you don’t want to TOO easy for device to become unpaired and re-paired. If it was possible to just send a ‘blanket’ command to unpair every device you’d run potential risk of someone messing with your system. Most likely they wouldn’t be able to do any serious harm, but they could make your life a PITA is they kept unpairing your devices at the drop of a hat.
So, while possible to wipe everything and start fresh, it would probably take just as long as hooking things back up and figure out which device is which, and then renaming them appropriately.
For groups you can “ungroup” everything from the group and then have it all plunk into the main folder and then just re-group from there.
Now… have said all this, it would probably be a very good idea to email support and just see if there are some tricks that I’m not aware of. There might be a short cut that’ll save you a lot of time.