Your calendar is not your strategy
Somewhere along the way, content scheduling became confused with content strategy. They're not the same thing.
A content strategy determines who you're trying to reach, what those people need, what your business wants to achieve and how your content will help get you there.
A content calendar decides when that content gets published.
One is the brain. The other is essentially a diary with delusions of grandeur.
Both have their place. But if you're scheduling content without a clear strategy, you're simply organising your guesswork into a rather attractive spreadsheet.
And hoping for the best isn't really an organic marketing strategy.