Our business is a collection of bought companies and people. What we find is that there are multiple 'standards' at work when it comes to layers. Even if we could persuade everyone to join up to a single paradigm it wouldn't be painless because the dozens of years of legacy data (and data from contractors and on and on) will be using a different set of standards. These non-standards make viewing the assembly layer tree completely painfull. Would prefer to have all the non-standard stuff dumped into a default system node so that our normal layers don't end up drowned by the almost limitless other layers that exist in our legacy datasets.