This sort of nitpicky comment is exactly why people stress about putting stuff on the Internet.
Having published and maintained an app that is in active use by even a couple hundred users gives you an advantage in employability and quite a big one at that.
Your post makes it seem like you have neither published an app yourself nor hired single devs who have, and it's easy to not appreciate.
He’s on a 3 person podcast that could very well gross over $850K a year - 3 ad reads * 5500 * 52 weeks a year [1]. I wouldn’t make doing an app a high priority either.
He’s also on other podcasts.
Heck Marco, his cohost, has been very successful first with Instapaper and then with Overcast. He will be the first to admit that his UI skills aren’t that great.
It’s not like Tumblr - he was the initial developer - was ever a thing of beauty.
