I've heard stories of lightning blowing holes in CSST and there was some controversy here over whether it should or should not be bonded, I don't recall the outcome. I've only ever bonded black iron gas pipe.Around here the yellow flex gas lines have become problematic in some areas due to lightening strikes and they have doubled down on grounding the gas lines . A lightening strike can melt right through the gas line or water lines and cause you all sorts of issues, and in our town we seem to have an area on the north side that has had a lot of fires and hits.....
the problem I have run into is -- over time --- the ground becomes loose, disconnected, corroded or whatever....
I have grounded the hell out of my property.... bring it on....
Since I'm retired now I don't now but I will ask one of my inspector friends what they are currently doing here.Ive never heard that Bonding csst is controversal only that its required I never heard dont bond csst?