Even the US Mulberry did not survive the sea conditions at Normandy and it was well protected by a breakwater of sunken ships and concrete caissons.
Trouble is/was that the Big Guy announced it during the State of the Union Address, so the military had to comply. I’ve read that the Army pier is/was designed for use in existing harbors that have been damaged/destroyed by war or natural disaster, not on an open coast subject to winds, tides and waves.
On top of that, the Army and Navy have pretty much abandoned the equipment needed to perform such an operation. At least two Army vessels suffered major accidents in getting to the Mediterranean Sea.
Then there’s the whole business of a non-state actor being able to hold off the United States Navy causing U.S. flagged ships from transiting the Red Sea and Suez Canal.