It's amazing how often I find posts written about the exact same topic I have just recently written about. First thought is always that somebody has read what I had to say. But more often those are in big publishing's where I don't anybody would read my humble texts. Sometimes I also find posts about the same topics after I have written about it, but soon realize it was actually written before me.
Of course, there is so much written on the internet these days that it's more than probable for more than one author just to write about the same topic by pure chance. Coincident a do happen but we just tend to draw the relations. And there is also the thing that when something is familiar to you, you tend to notice those things more easily.
Of course, the internet itself is also an echo chamber. Whenever there are two similar posts written they might not be directly related in any way, but instead, they might be just the product of some third post written prior to them that has sparked the similar thoughts in both authors.
No matter what, there is always room for different points of views on any topic.