What planet are those people on? That's Gucci bag territory. They can take their res and shove it, that's almost NINE GRAND (granted, Canadian pesos) for a freakin display! Who is this for, just Pixar employees?
And looking at Amazon.de listings, it's definitely possible to buy a cheap arm that's good for 7.5 kg. A "suptek Monitor Mount" is good for 10 kg according to the listing: https://www.amazon.de/dp/B0833NQ8CR
There’s huge monitors from other companies that come with mounts that handle more weight than that. Granted, it’s not some art deco CNC monstrosity.
I think the sibling comment nailed it: this is just a status symbol.
We're not just talking about Apple's stand-alone display, but even their laptops are high-ppi. 13" M4 Apple Air:
> 13.6-inch (diagonal) LED-backlit display with IPS technology;2 2560-by-1664 native resolution at 224 pixels per inch