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Yea, because they pick up a lot of inertia while coming down.

But two problems:
1. Guidance is a bitch.
2. Getting them up there requires 1000x the energy that they end up releasing in the end because of the "you need fuel to move the fuel" problem that makes rocketry suck.
Tungsten isn't that expensive, I mean, you don't build buildings out of it, but it's not precious or anything.

The major costs are the insane amount of rocket power for the ride up, and the crazy guidance system that can steer without burning the flaps off on the ride down...
Yeap. A lot of energy to get them up there to the needed orbital velocity, then a lot of energy to get them on course (orbital maneuvering is extremely expensive from a fuel consumption standpoint), then there is the energy required to de-orbit them towards their target. Then there is the time factor for all of this setup; hours at a minimum, if not days to deliver a ballistic rod onto a target. Given current intelligence capabilities, the enemy would see something like that coming far in advance.

Orbital simulators like Orbiter 2024 can offer a glimpse at the complexities involved. The de-orbit is the easy part, but the rest would be a bear.

Hypersonics, at the end of the day, are cheaper to produce and quicker to deploy.