Oh you went from “pretty much everywhere” to “well, uh, many commonwealth countries”.

You sure you didn’t have to go check what it meant, and then you were shocked at how many of what we’d consider “developed countries” actually do not use common law?

In the EU, only Ireland still has common law.

All others use civil law. And I’m sure you didn’t know that. :)

And precedent is present in civil law systems as well.