Merging folders or rather not

Wow, I didn’t realise OS X can’t properly merge folders
http://www.howtogeek.com/198043/how-to-merge-folders-on-mac-os-x-without-losing-all-your-files-seriously/

Windows 8 has similar rubbish - if you try to move a backup folder over an original, it will duplicate every single file without giving you any options (like 7, Vista, and every other Windows I can remember did).

Hmm … file managers that don’t let you manage files … novel approach :o