To be fair, it was all new back then and people were playing with ideas, so a 3d file browser seemed like a cool idea. A bit like the metal roller on the Paris Metro ticket machines https://www.youtube.com/watch?app=desktop&v=9SjBfRA3YzA
The discoverability on those things is definitely lacking. I think it took us five or so broken touch-screens before my wife noticed that you could use that to select menu options instead! I guess once you know it's fine though? Feels a bit dated compared to the typical touch & go card payments elsewhere in Europe now though.
I couldn't work it out for a good while, because it's the most unintuitive UI I have found on reasonably recent ticket machines. Once you know how to use it, it's ok.
ProTip: if you travel from London on a train, the buffet sells Paris Metro tickets.
