Well, this is interesting because I've got another bit of research/info that ties in with what you have said and also the OP's post. According to research done

Well, this is interesting because I've got another bit of research/info that ties in with what you have said and also the OP's post. According to research done by Carol Dweck, there are two types of mindset when approaching a challenge, much like learning new, tougher-to-grasp things. You either lookst it from a fixed "be good" mindset or a growth "get better" mindset. With a be-good mindset, you will be less persistent because failing means you're not so good. With a get-better mindset, failing won't matter as much, if not at all. This is because, in your minds eye, you're focused on improvement, so even if you fail you feel you will learn something (99 ways to not make a lightbulb). With a get-better mindset, fear of rejection and failure are extinguished. It also ties in with what the OP is doing because he is focused on learning when building and shipping products. If his sole intention was to ship and not actually learn anything from it but rather as a demo of his skills, would he ship as much?