It's also that I have nothing to say anymore. I'm not sure which is the bigger reason. I didn't have all that much to say in the past I think. I just found random stuff interesting and wrote about it. But that goes back to the top issue. Anyone can tweet or post to their facebook in moments so it feels mostly pointless to try to share in an ocean of sharing.
At the moment having a well made Youtube channel seems like the new similar outlet. It's hard enough that it's semi rare. Sure anyone can post themselves just talking about stuff but not everyone can make Veritasium, Primitive Technology, Kutzgesagt, CGP Gray.
Let me also add, at least for me, it wasn't a small amount of work. A typical post took ~8hrs. 4~5 writing, editing, correcting and another 2-3 hrs editing images. There were shorter posts but the ones that made it feel worth doing were the longer posts.