Rule 1: “If you haven’t tried you don’t know if it’ll work”.
World’s first floating wind turbine was Equinor’s Hywind Demo situated off Utsira in the Norwegian sector of the North Sea in 2009 to prove that floating wind farms were feasible:
It is still there, now as Unitech Zefyros and producing power as part of the Met Centre for testing of new concepts:
Here is one of the concepts being tested:
Another is a 10 mW turbine on an innovative concrete floating base and a new mooring system:
So try first, before saying "it ain’t possible. Not everything that is proposed and tested prove to be usable,
Rule 1 still apply. (but then you DO KNOW)