This is semantics at this point, but ACPI "is" not executable code. It contains executable code in form of methods, but it is a structured container for many ty

This is semantics at this point, but ACPI "is" not executable code. It contains executable code in form of methods, but it is a structured container for many types of data (they are called "tables" for a reason). You could very well embed DT in ACPI and there are platforms out there which do that.