> I say 1MWh extracted daily
Consider a single offshore turbine in the Galloper wind farm is rated at 6 MW and this doesn't look so impressive.
> a dumb metal object
That's the thing. It isn't a dumb metal object. It requires generating gear, maintenance and protection from weather. Also consider the Ever Given is 1/4 mile long. These are big volumes you are talking about.
No matter how you look at it, wind is a tough candidate to beat when it comes to offshore power.