No they are actually benefits from learning photoshop because you understand what they are doing more technically. Adding a drop-shadow as an example. Or doing a gradient with specific ratio, angle and so on.

You literally get access to the very parameters and their values you might have to use.

It's not about learning how to use photoshop. It's learning how photoshop works, just like I learn code to understand how most code work. That doesn't mean I would call myself a developer who can code like a pro.