Yeah, but when you're not a product company, your UI is driven entirely by business requirements. I'd love to see if Google's internal apps (e.g. HR) are as cle

Yeah, but when you're not a product company, your UI is driven entirely by business requirements. I'd love to see if Google's internal apps (e.g. HR) are as clean as their homepage? I know that Gmail and Greader are not "simple" or "minimal". Complex requirements -> complex UI. That said, if your UI is intuitive, and matches the users' mental model of the requirements, those complex UIs can still be very usable (e.g. gmail).