Sorry if this is a dumb question, but don't the alternative stabilization systems only work when underway?
Most stabilizers today are zero-speed stabilizers. Actually Quantum trademarked the term Zero Speed. The reduction of roll on Naiad Stabilizers is promoted as 90% underway and 70% at rest.
Side Power then claims their vector fins are 50% more effective than regular stabilizers.
There has been a lot of advancement in stabilizers and they're no longer just fins stuck on the bottom of the boat. Fin stabilizers do have to be larger to work at zero speed than if used just for underway.
Gyro's do have several significant pluses. One that's important to many is that they're fully contained inside the boat.