High-orbit service loops are often described as if the hard part is getting technicians and robots to the right structure. That is only half the problem.
The other half is inventory shape. A service loop can look well provisioned and still become fragile when one low-volume part sits outside the stocked repair set. Bearings, seals, couplers, and cooling-valve assemblies do not fail on schedule, and a missing component can strand a larger repair sequence that looked routine on paper.
This is why spare-part strategy is now one of the quiet differentiators between orbital operators. The strongest loops are not the ones with the largest warehouses. They are the ones that understand which tiny parts can immobilize expensive systems if they are absent at the wrong altitude.
High orbit rewards planning that looks obsessive from the ground. Up there, missing one small part is often the most expensive mistake in the room.