Earlier quoted context omitted.
Vastly higher speeds is the reason it would be valuable if it can be made economically feasible.
It can't be made feasible from an engineering POV, not just economically. It's virtually impossible to maintain a relevant vacuum in hundreds of kilometers of tunnel. The temperature stresses alone would cause leaks unless using some very special materials (if any exist).
https://www.tesla.com/sites/default/files/blog_images/hyperl...
> Another extreme is the approach, advocated by Rand and ET3, of drawing a hard or near hard vacuum in the tube and then using an electromagnetic suspension. The problem with this approach is that it is incredibly hard to maintain a near vacuum in a room, let alone 700 miles (round trip) of large tube with dozens of station gateways and thousands of pods entering and exiting every day.
> All it takes is one leaky seal or a small crack somewhere in the hundreds of miles of tube and the whole system stops working. However, a low pressure (vs. almost no pressure) system set to a level where standard commercial pumps could easily overcome an air leak and the transport pods could handle variable air density would be inherently robust. Unfortunately, this means that there is a non-trivial amount of air in the tube and leads us straight into another problem.