A global average is a strange thing to obey. When a study says engagement peaks Tuesday at 9am, it has averaged together fitness coaches in Sydney, restaurants in Berlin, and meme accounts in Ohio — audiences that are literally asleep during each other’s peaks. The output is a number that describes everyone and applies to no one.
There’s a second problem: the tables describe when other people post successfully, which partly reflects when other people post at all. Following the chart puts your post into the most crowded moment of the day on the theory that crowded means good.
None of this means timing is fake. It means the answer is local to your account — and it comes from three things you can actually reason about.