I'm more thinking about the content, for example the mindstorms computer has a loose battery box and main unit it has the exact same category and (lack of) keywords the complete one has.
As far I know you usually only need the complete one so when you want to make a part list listing only the practical things you can't filter the lid etc out using keywords, you have to do it using the part numbers.
This isn't that bad but it isn't future compatible, new parts won't automatically be filtered out (if needed) with new part releases. You'll will have to update the part number exclusions at that point.
I suppose the main question I'm asking is why the keyword meta isn't used for identifying subcategories?
As far I know you usually only need the complete one so when you want to make a part list listing only the practical things you can't filter the lid etc out using keywords, you have to do it using the part numbers.
This isn't that bad but it isn't future compatible, new parts won't automatically be filtered out (if needed) with new part releases. You'll will have to update the part number exclusions at that point.
I suppose the main question I'm asking is why the keyword meta isn't used for identifying subcategories?