1D and 2D are just mathematical abstractions. Everything is just 3D and that’s it. There is no time, just space with a state.
(I tried to explain better in comments so please check that. I would be glad if someone could give me a response to this brain fuck I’m having)
I get what you are saying, but it is not wrong. It is not even a simplification. The surface of any object is 2D, and the surface of a flat object is the simplest form of a 2D coordinate system.
What I meant is that some people portray the thin flat object itself as a 2D object, e.g. a piece of paper opposed to a box. I do understand that it’s intuitive to associate the absence of a dimension with a value close to 0 for it and vice versa, because that’s how we visualize it.
I haven’t heard anyone actually claiming that a piece of paper has zero thickness before.