I used the plug and twist type shore power cords for 13 years on my Grandbanks trawler. 95% of larger boats use this system. Really expensive yachts use a permanently wired reel type system similar to large RV's. I learned the good and bad of the plug type of electrical connection.

First your connection will be outdoors in the elements (rain, snow, frost) and they don't have as long of life as a permanently attached cord.

The biggest reason I would shy away from making that change is peace of mind. The first time I inspected the interior of the receptacle I was scared by what I saw. The corrosion from the elements was awful. From that time on I opened up the receptacle each year to inspect. I think I replaced mine 3 times during those years. Unless there is a compelling reason to change it is just not a great idea.

Being in a sal****er environment I also had to replace the cords 3 times.

Perhaps an RV application would be better than a boat sitting in salt water but I would never change my RV to that system.

Just one ex-boaters opinion. We're enjoying the sun in Tucson.