. The import / librairies system with LR is just a useless nightmare to me
i guess you do no keywording?
anyway.... it is obvious that you have NO CLUE AT ALL what a library is usefull for. 
sorting you images into folders will help you nothing if you have thousands of photos and need to search for a motive.... and this is only one example when a database approach comes in handy.
try to find all images with a "ball" on a "beach" and a "sunset" in a 100000 picture collection.
takes me 5 seconds to search all my images for these keywords.
His statement was it is a useless nightmare
for him. Maybe you have no clue yourself if you think only your requirements are valid. A library does not give additional features. Everything is possible without, it just takes more time. I don't do keywording myself but it is possible. Of course a database is faster when searching 100000 pictures but that is
your requirement, not that of everyone else. I have other use cases that just don't work with a library. Not uneducated or naive, just different.