Innovative ways to float skyscraper-sized wind turbines

I wonder why you wouldn't deploy a spar horizontally, filled with dry ballast powder evenly along it's length, then tip it vertical once in position and pump in water to set the ballast. This seems an obvious approach, allowing use of a shallow dock ,so there must be some issue with it

Looking at the designs presented for floating oceanic wind turbine bases shows, that there is a need to have as much stability as possible, while moving in response to wave action and tides.

By default, all power generating equipment is 100% duty cycle , 24/7/365. For fixed land based machines the various loads and environmental wear conditions are more or less predictable. Marine instalations on the other hand, are notorious for destroying anything and everything, very especialy anything with moving parts, due to all of the land based factors, plus operating on an unpredictable moving platform. Total failure of the entire structure can be initiated by the failure of any one of many bearings/joints where movement between components takes place,deep underwater. Inspection becomes a challenge and service at sea impossible. The many failures of underwater tidal generators bears testimony to the dificulties and challenges.