In web design, the look of the interface is important, but what and how that interface teaches us to think can be more subtle than we realize. If we spend fifteen minutes a day in front of some beautiful icons and single words like "send", "download", "follow", it probably wouldn't matter much. But as soon as we decide to spend our whole day in front of the same screen, the situation changes. We may start to think with single words too, being unable to form a complete sentence or to keep a meaningful conversation. In other words, interfaces can be a powerful way of rewiring the brain and as web designers, we still underestimate the effect this has on the human psyche. Every word can trigger an emotional response and direct people's thoughts in a certain direction. Such preconditioning seems to be used quite well by corporations who want us to think in a certain way. But when we agree to use a robotic language on a daily basis, we neglect what makes us human and thus risk to lose some of our intelligence. Moreover, there is the danger to transfer this lingo in our conversational speech, which will make us sound less natural and trustworthy.
An element of imperfection makes the design more human, which is more likely to lead to better engagement when most people can easily sense vulnerability. It's better to keep our interfaces simple only when we don't deprive them of our human touch.