But Illustrator and InDesign can be used on multiple devices (Mac and PC) and use cloud features. You probably mean mobile devices.
I conceptually understand, but as a designer this annoys me every time I look at it. The icons don't feel integrated, and the icon differentiation does not explain why they are different, so for most people the reason is lost and it looks like a mistake.
Adobe Certified Expert & Instructor at Noble Desktop | Web Developer, Designer, InDesign Scriptor