Correctly assigned layers are what ever CAD manager strives for & what every layer combination needs.
Every line, object, fill or text that you place must have its layer set correctly.
Without layers - layer combinations are meaningless.
The best way to go is to keep the number of starting layers to a minimum, allow for the sensible creation of new layers when needed.
Remember also that Archicad is object or 3D based and not the same as a 2D drafting program. Because elements are separated by object type, fewer layers are needed than in 2D programs.
Below is a snapshot of our standard starting layers which work as follows;