Can laptop chargers use "AC wires" to carry DC power?

Question

Cables and wires

If you look at a standard laptop charger, then the section along which 220V is taken from the outlet is made with a rather thick wire in which two "cores" run in parallel. The wire for transmitting direct current from the PSU to the laptop is built on the principle of an "antenna" or "coaxial" cable, i.e. there, the earth is the outer shell, and the plus is the inner wire, which is covered by this outer shell (naturally, there is insulation everywhere between them).
Purely technically, nothing prevents the transfer of direct current through two parallel "cores" (look at the same MOLEX or power for video cards), but for some reason manufacturers do not do this. Question: Why?
Somehow I had a chance to briefly talk on this topic with a person who makes a living with electronics and microcontrollers, and he said something like "in a coaxial cable, the electromagnetic field is formed as if inside the cable, and in a wire with two cores, the field will go out strongly outside the cable" or something like that. It seems to be due to the high current (from the power supply to the laptop) and the constant nature of this current (for AC from the outlet, this is not the case). And that perhaps this is done to minimize the effect of the electromagnetic field on a person. Those. theoretically, the system unit is closed with a metal cover and little goes beyond its limits, therefore everything in MOLEX and in the power supply is done with parallel wires (well, plus a decent distance to a person). Is it true about the fields? Can a strong electromagnetic field really harm (or am I not calling it that at all)? Perhaps there is some standard for "saturation" with fields (as a standard for lighting workspaces) and if you do not use a "coaxial" cable, then the charges simply will not fit into this standard?
The question arose due to the frequent wear of a thin wire on charging and the desire to replace it with an industrial thick rubberized cable from a power tool, but there is not enough theoretical basis to be sure that I am doing everything right.

Answer 1

I allow!
You can't transmit only over long distances and high voltages / currents
because the resistance of the cable will eat everything up
. In general .. direct current does not create any EM pulses, so don't worry at all.

Answer 2

- the wire from the laptop PSU is not coaxial, but simply with round insulation. "coaxial" connector only.
- "thick" network wire is used due to insulation requirements (to a lesser extent) and due to the fact that it is a standard cheap manure shoved into any technique (to a greater extent).
- coaxial cable is designed not for direct current but for alternating current.
- a familiar "electronic engineer" either belched nonsense or did not understand the question and spoke about similar things but from a different topic.
- you can replace it with any wire with a cross section of more than ~ 0.5 sq. mm., twisted in any way that you like.