Early on in the development of this package, I primarily used this algorithm for neutral wind stress calculations. Therefore, I made a static function to access this (and other parameters I deemed arbitrarily relevant) without using the OOP interface. In hindsight, I think this was a bad idea - it made the API cluttered and docs harder to explain. I think the OOP interface is simply better, and consistency is valuable.
I am considering removing the static function options before 1.0 release. This should begin throwing a deprecation warning in the next couple minor version releases, before a 1.0 version release.