Yeah division of labour is a corner stone of modern society. The title do you think it be fun to do ... would appeal to me more than to try to guilttrip people into doing something / humblebrag. However I do find the post inspiring.

Well that depends, are you a singer? Then it's probably a good idea to communicate with other singers beyond the local bar where you sing now and then.

Not saying that everybody should start a blog or that most blogs are not garbage written by people that don't have anything interesting to say. But if you want to take your career further it's probably a good idea to immerse yourself in your professional community in a way that expands your reach further than your near friends and co-workers. A blog can be a way to do that.

The post speaks about "owing something to someone" but this holds even just by purely egotistical measures.