The adult public’s taste is not necessarily ready to accept the logical solutions to their requirements if the solution implies too vast a departure from what they have been conditioned into accepting as the norm.
Every human act is a response to a personal need. The motivation for all personal behaviour is to produce a sense of "feel good", a sense of inner peace and well being. To expect a person to go against his desire to feel good or as good as he can feel under any momentary condition is illogical and irrational.
Choosing a typeface is an opportunity for your website, app or digital product to show personality, be memorable and stand out among its competition. And if you’re just using Open Sans, or other overly popular typeface, you’re missing out on that.