This is true, but it's not a block to users emulating a folder/subfolder organization using notebooks/tags.
>>Good examples are the mobile versions as EN-Apps. They will not show the tag-superstructure, as if it did not exist.
I use an iPad (IOS). All tags are avaiilable, but no hierarchy; we see a flat tag list.
There is no issue with the Mac, Windows and Web platforms
>>Who tells it will still be like this a year ahead ?
Cue Que Sera, Sera
>>Maybe it would be more flexible to project the desired hierarchy into a sort of numbering code that goes right into the header
I.e. The Note Title