Voted Big CTA, on a product detail page the add to cart button shouldn't have to compete with anything else for attention. Small CTA reads more editorial but riskier for conversion.
Everyone thinks a data dashboard should look complicated.
I think that is exactly why most of them fail.
I just finished Helios, a tool that tracks solar energy assets in real time. Dozens of sites, live output, verification records, a wall of numbers. The kind of screen people drown in.
Most designers would make it feel technical. More lines, more glow, more charts. I did the opposite. Every number had to answer one question in half a second, is this good or is this a problem. If it could not, it lost its place.
Because design is not decoration, it is closer to math. It is deciding what to remove until only the truth is left.
Complexity was never the enemy. Confusion is.
Get that right, and people trust you before you have said a word.