[scroollSmoothrer & Scrollbar]

It just doesn't look the same as you can see in the example you pasted, although the fact that it looks ok on a macbook, in general, locomotive operation is completely different and a custom scrollbar is built there. Which probably can't be done on gsap smooth-scroll.

[scroollSmoothrer & Scrollbar]

I was more interested in making a scrolllbar that has a locomotive scroll. It's not about simple styling, but about its smoothness and fading when inactive. Gsap smoothscroll probably doesn't have it or I haven't encountered such an example as in the link below

 

See the Pen WNwjEaL by ebinabo (@ebinabo) on CodePen

[scroollSmoothrer & Scrollbar]

Okay, thanks for the explanation. Will try to do it another way

[scroollSmoothrer & Scrollbar]

I would like to combine scrollsmother with scrollbar, I mean mainly interesting scrollbar styling (disappearing etc.) which I get thanks to scrollbar, but it doesn't work for me with smoother gsap where I have a lot of elements using data-speed. Can it be combined? 
this is what I have in the code:

 

const smoother = ScrollSmoother.create({
content: content,
wrapper: '#smooth-wrapper',
smooth: 2,
effects: true,
});

let bodyScrollBar = Scrollbar.init(document.body, { damping: 0.1, delegateTo: document });

See the Pen abNGeKZ by mikeK (@mikeK) on CodePen