Hi @GeeK Reverse , Not sure if this helps, but here is a visual illustrating @Jeffrey_Smith , and @Abhishek Rao suggestions. How to create a Gradient Swatch, set the needed transparency stops via Gradient Feather Tool, and set its Angle and Type via the Gradient Swatch Tool panel.
 
Set any number of transparency stops:
Set Type and Angle, or drag out to set the gradient angle and length:
 
I think InDesign’s more complex approach is because, unlike AI and PS, an ID doc can contain a mix of RGB, CMYK, and Lab colors. The other apps have a single color space.
... View more