The cubes I've assembled use solid core cable whips that are rated for 40 amps (like you'd hook up an hot water heater with) and serve four units. We never had power issues even though we all used pretty beefy hardware (think Xeons and Quadro RTXs) with dual monitors, a UPS, cube lights, etc.
Many offices are full of only laptops - those are drawing ~200 Watts peak, and then may another 100 for a couple of monitors and peripherals. That's many more users. My office has literally that - boxes with 4 sockets each in the middle of a shared space which we all run our power-bars to.
Sure, the open-plan ones of today are amenable to a low degree of wiring. The types of employees made to sit in those offices are amenable to a low degree of wiring.
The average office that has cubicles, though, is also one that’s wired for per-employee power delivery.
Or, I could say it as the reverse: if you know you’re setting up an office to have fixed workstations (e.g. a CG art department in a video game studio; or any department in a company with a pipeline whose main software is a hog, like desktop publishing), then you’ll likely set up with cubicles rather than open-plan, because a workstation kind of implies gradual personalization with bunch of surrounding cruft that needs floors and walls and shelving.
(I have a feeling that even in FAANG, the people who use workstations aren’t sitting in open-plan areas. Anyone care to speak to that?)
And, because of this, the “standard” kind of cubicle partitions are expensive, because they’re also expected to work to handle part of the wiring requirements for power delivery. If they were just plyboard, they’d be cheap; but they’re not just plyboard.
