Because a UI control exists before Windows 95 doesn't mean it's understood by the majority of users. Also, there is a larger amount of users with minimal software exposure now than ever before, due to tablets and smartphones.

If your computing experience is limited to iOS for example, chances are you'll never even have seen a nested tree view control, much less understand the hierarchy behind it.

At least just read a minimum on usability and UX, before being so rude as to "call bullshit" based on your own personal opinion.