I have done A/B design testing on ~10 mid-tier "consumer products" eCommerce sites, and giant firetruck-red 3D bevelled "Buy Now" buttons converted insanely better than minimal ones.
Personally, I want clearly-labelled tactile buttons that make me want to push them. Flat UI is more brutalist than humanist.
Personally, I want clearly-labelled tactile buttons that make me want to push them. Flat UI is more brutalist than humanist.