While I don’t really think there is one right way, we can all do what we believe is right.Not buying likelihood of wear and tear. There aren't any real moving parts involved. My first plug-in vehicle was plugged in 2-3 times a day for nearly 7 years, No wear and tear whatsoever, none! Basically, you came up with a solution in a desperate search for a problem.
But it is just common sense if you plug anything in and out there is wear on those parts. ANYTHING that contacts another and slides across it will wear to some degree, ANYTHING. The real question is the wear of daily use enough to worry about over the normal lifespan of the vehicle but say there is no wear whatsoever is false.