Oh right, let me clarify:

The Spine

Early plans [for Neom] proposed an underground railway with 510-kilometre-per-hour (317 mph) trains that could travel from one end of The Line to the other in 20 minutes.

From: en.wikipedia.org/wiki/The_Line%2C_Saudi_Arabia#Th…

I meant to refer to that thing. I should have said 20 minutes, not 15, and I shouldn’t have used the specific phrase “15 minute city” to refer to a city that can be traveled anywhere within 15 minutes. Mea culpa.

Back to the point, though: none of that changes that a Line is mind-bogglingly stupidly bad compared to just a basic grid.