Bad to seal holes around gas pipes with cement?
The feed through a foundation or wall in my state requires a listed flanged pipe.
I don’t know what the coating is but there is a coating to prevent corrosion from contact with cement products.
The flange prevents movement of the earth causing a failure inside the home but I live in a seismic zone so movement is a possibility.
Would I go back and update an old home? Probably not unless a a service change was needed or insurance required it.