A microwave oven might be a better example, since a chair is inert.
On a microwave one has to have discoverable controls. Imagine if everything was just flat with the fascia, looking no different in presentation to the maker's logo.
It might say 'Cooking power: 80%' with no indication of how to adjust. Apparently, though, if you press on the word 'power' repeatedly you can change it!
I don't think we'd accept that.