Having generated ~250k web design images the past few months, I've concluded generative models, circa 2026, still suck at it. Presumably because the difference between an 'OK' design and a 'Great' one is pretty darn small and far too nuanced. That said, Imagen easily takes the cake for workable design creativity, but even then, it takes 1000ish gens to get something decent, maybe 200 if you aren't too picky.