[mead5432]

On your designs, is it just that the user reviews some comps or is it something they can interact with (e.g. InVision)?

In my experience, a lot of issues around a design doesn't actually come out until someone uses it.

The other side is that one reason why code reviews work is that a developer who reviews the code has incentive to pay attention as a bug introduced here may be something they have to fix later. A few minutes now might save a few hours down the line. If your design is only being reviewed by product people and a huge problem is missed, it isn't the reviewer who has to fix it.