Hosek-Wilkie is pretty much what I’d expect a physical sky to do, when bundled with a renderer. Night usually requires some more artistic freedom anyway, to show stars, etc… so one usually goes about it by blending it with night skymap along the sunrise/sunset. Mainly, fine tuning possibilities are not always a good thing. Great thing about Hosek-Wilkie model is mainly that it’s simple to use, not overloaded with parameters. Basically it comes down to just ground color and turbidity parameters. Pretty physically based.
That being said, that’s what I would expect stock physical sky model every renderer should natively be bundled with to do. Yours is more advanced model, which is fine since it’s a third party addon. In such case, it indeed makes more sense to have more complex model.
All I meant was that currently, Blender has only half complete, unusable implementation of the Hosek-Wilkie model left in very embarrassing state.