I've risked it. I've done it. Several times. It does not "screw up" the jailbreak because this jailbreak does not change anything in the initial boot sequence, so there wouldn't be anything TO mess up by doing an "erase all & restore". Not to say it isn't quirk free. Though I've never had any problems restoring on device on any iPhone, for some reason if you do it on an iPad Pro, the bug of not installing Cydia ever will return. So don't do this on an iPad Pro. So far no problem on an iPhone.
That is false.
It messes up this Semi untethred JB also. It screws up the app that you have to run in order to JB after each reboot. And causes many other issues with cydia and so on. Go on Reddit and read. So if you cant JB after you reboot then your JB is done.
But do whatever you want if you want to risk it.
Everyone else should avoid it or they will be in deep trouble.