From the 1980s, design thinking has emerged in companies as a method for practical and creative problem solving, based on designers’ way of thinking, integrated into a rational and iterative model to accompany the process. In companies, design thinking helped valuing creative teamwork, though not necessarily professional designers’ expertise. By pointing out two blind spots in design thinking models, as currently understood and implemented, this paper aims at shedding light on two rarely described traits of designers’ self. The first relies in problem framing, a breaking point that deeply escapes determinism. The second blind spot questions the post project process. We thus seek to portray designers’ singularity, in order to stimulate critical reflection and encourage the opening-up to design culture. Companies and organizations willing to make the most of designers’ expertise would gain acknowledging their critical heteronomy to foster innovation based on strong and disruptive visions, beyond an out-of-date problem solving approach to design.