AC can better cope with differing and changing length of cable. Just think of all the devices connected and disconnected all the time from the electric power grid. When you have a known distance and known capacity requirements DC is in advantage. e.g. connecting an island to mainland power.
pahh, Märklin. I swear by Trix!
I have to concede a point, insofar as I am beaten by the umlaut gap. As for the rest, I'm sorry but you fall into heresy as you declare so and so is an advantage in connecting an island to mainland.
What is an island? Etymologically it is an 'insula' in Latin, something that is insulated, separate, removed from the rest. And why is an island an insula? Because the divine will ordered so, for reasons we can't fathom or sometimes we can. Cases in point: Sicily and the British Islands. These examples are obvious as they are inhabited by strange people who are better left alone, that is, insulated. The Sicilians speak a strange dialect, have half their cousins in America, shoot or knife each other like they eat confetti, and their cheese stinks like a Portuguese infantry barracks after a 30km march in high summer. So an entire island for them.
The British are what they are by themselves and leeching the Commonwealth of what's best in them was not enough to improve much. At least some cheese are sturdy enough to bump downhill while troves of hooligans do their worst to arrive at the bottom before the cheese. Two moderately decent British are Prince Philip and Nigel Farage. The British decided to do a Brexit which theoretically should be a voluntary insulation but in truth looks like a knife fight inside a coal bunker at midnight with the lights off. Insulate them, I say.
The Irish we'd like to spare as Great Britain got in the middle, and for the Emerald Isle to drift to the French or Spanish shore would take an inordinate amount of time, although less than an eternity. Besides, they wouldn't want to leave the Ulster behind, and frankly, whenever the Brits get into a scrap there they go like hooligans after a cheese to take the Queen's Shilling. Actually since Decimalisation the shilling ceased to be, so that's mainly a figure of speech.
In order to keep on topic I also have to mention Australia, another island but big as heck, 11 times the area of Texas, imagine that. Not much to say other than the place was so insulated already that the British (remember them?) used it to further insulate convicts.
So do not figure ways to connect islands to the mainland or your soul will be in immediate peril.