Does higher power wiring go higher in a control cabinet?
As you say, the cabling goes high then travels low. The reason I understood for it was safety.

If a cable falls out under its weight because its not secured properly, its bare ends will be going to a load and unlikely to be carrying a hazardous voltage.

If the routing of power was travelling upwards, the same bare ends would be coming from a supply.

There are several by-products of this decision, such as keeping the big on-off switches at the top and so on. But safety was what I understood to be the original idea. I imagine someone took that approach and copying rippled it out over the decades to become commonplace.