The B2 was designed to stealthily penetrate long distances into the USSR. It was a 1980s black program that eventually (at absurd cost) only shipped about 20 aircraft for a mission role that no longer existed. It's not surprising that the infrastructure and supply chain to maintain them into the latter parts of their operational life didn't materialize.
I am curious about what the current role of the B-2 is, as the US doesn't really have much need to bomb anywhere that it doesn't already have complete air superiority (and retaliatory strikes that wouldn't be preceded by pounding the local air force flat are best served by missiles, drones and other things that don't take a crew somewhere they might crash and end up confessing to war crimes on live TV). It was used to deliver a few bombs in Afghanistan and Iraq, but not in a role that couldn't have easily been filled by a B-52. Or a B-17. (I checked. There are currently more than 40 B-17s still flying in the world. That's twice as many as there are B-2s. Hmmmm...)
It’s still a part of the so-called nuclear triad. Whether it’s actually critical for second-strike credibility (absent a 24/7 in-air alert, which I think no longer exists?) is up to debate, of course, but that would be the rationale.
I am curious about what the current role of the B-2 is, as the US doesn't really have much need to bomb anywhere that it doesn't already have complete air superiority (and retaliatory strikes that wouldn't be preceded by pounding the local air force flat are best served by missiles, drones and other things that don't take a crew somewhere they might crash and end up confessing to war crimes on live TV). It was used to deliver a few bombs in Afghanistan and Iraq, but not in a role that couldn't have easily been filled by a B-52. Or a B-17. (I checked. There are currently more than 40 B-17s still flying in the world. That's twice as many as there are B-2s. Hmmmm...)