The difference, as I see it, is between giving a general advice and giving advice as a response to someone venting about something. There is no problem with telling, "I have learned that X", or "in my experience X is a good thing to do when Y". The problem is when you answer with, "you should do X" when someone tell you about a problem they have without asking for help with solving the problem.

It is even a difference between me saying something like: "The way this work in javascript sucks", which clearly is venting. And: "the way this work in javascript is so confusing, can you help me understand it?" Someone writing a blog-post about how this work is of course also advice, but not as a direct answer to someone venting about it.

Meta, I know the sentence structure wasn't the best, but I don't want help with improving it right now