Engine Wiring Harness Question

Question for those in the know, Was it common practice to wrap a harness within a harness? I have power windows in this car and the harness for the window safety relay (2wires) is wrapped by itself and then is part of the speed control wiring and wrapped within that wiring. The power feed for the convertible top is also part of this wrapping. I don’t know if it has always been like this or if these should be separate wire assemblies.
Thanks,