While most professionals agree that sending a post-interview follow-up is common courtesy, when you add unnecessary barriers to your hiring process you risk coming off as a sociopathic weirdo, among other considerations:
Nobody is immune to bad days. Coffee spills, traffic jams slow you down when you're already running late
Today is my 29th birthday--the official first day of my final year as an "Under 30". As I approach my newest decade of existence, I've been reflecting on which words of wisdom I might share with my younger self, just as she's about to enter the proverbial "real world".