If you ever work on mains or high voltage equipment, a below grade concrete floor is a safety hazard, as its conductivity significantly increases the risk that any shock you may get will stop your heart. Insulating (or ESD dissipative) floor covering for at least 6' around the bench mitigates the risk.
For those paying lip service to ESD prevention, there is a whole industry dedicated to parting fools from their money. Placebo effect is only beneficial for human health - the boards and components neither know nor care what ESD 'theatre' (mis)management is conducting. e.g. see: https://sma.nasa.gov/news/articles/newsitem/2018/01/10/esd-wireless-wrist-straps-the-shocking-truth
Thanks Ian. I did watch Dave's mythbuster on the wireless straps just for fun yesterday. I figured they were pretty worthless. I have been using a real ground strap routinely to get into the habit. The Bertech mat with the connector will make it a bit easier.
It was after Dave's video that I ordered bench covering to replace my silicone solder mat. (Got the blue, but I would imagine that is no longer the sine qua non).
As for damaging parts, all education costs. Whether in felling trees (I am certified BTW), the stock market, electronics or mechanics. It is in the post mortem that we truly learn. Just wanna be the one doing it!
I DO understand about the floor. While good for ESD, bad for electrician work. When I am in the panel I wear rubber chemical gloves just for the helluvit. Wiring is all current (pun) US code so that is good. And like I said, I wear rubber shoes.
As an aside, I am pretty sure 120V is not going to stop my heart. I will not explain how I came to this opinion. I embarass myself enough.
It is not about risk avoidance, it is all about risk mitigation.