What sourdough "rules" do you break / can i break?

I keep discovering that the "required steps" of sourdough are in fact optional and you can make great bread without it.

* Preheating your oven? No, just put cold dough in a cold dutch oven and put it in your cold oven and turn on the temperature.

* Use starter at its peak? Nah, just use unfed, it'll be fine

* Feed your starter 1-2x a week? No, just keep it dry, and go without feeding it for months.

What else is there to discover?