@freemo sure, of course. If the math works for it, then you can use it. I'm just saying that there are some alternatives that sound interesting that may just work because it turns out to be a simplification of a subset of the math formulas involved. It's not unthinkable, and I'm just left with the idea that the current mainstream models seem complicated. Also, different math could end up approximating just slightly better/worse. (I'm a CS guy, so no physics background, just casual interest.)