Don't forget the ANO requirements
Which amount to telling your passenger to tell you about any aircraft they see whilst you're on the approach, yes?
So you can fly IFR and navigate by instruments en route with nothing extra needed to comply with these rules, but you need a sane human being as a passenger to make an approach.
It's a bit odd really as there's no such requirement when you're flying an approach for real, and you might be in brilliant sunshine above a cloud layer staring at the instruments with no passenger perfectly legally.