When does ballistic-missile accuracy change the target set?

Would a warhead landing within 10 meters rather than 100 meters matter?

Yes against hardened targets, but the retaliatory submarine-launched weapons discussed here were aimed at softer urban targets, where that difference mattered less.

A viewer challenges the claim that landing within 10 rather than 100 metres makes little difference, pointing to hardened structures. The objection is accepted, alongside a correction of an earlier recollection of megaton yields. The distinction then turns to mission: the retaliatory submarine weapons considered here are treated as weapons aimed at cities, while accurate land-based missiles are associated with hardened targets. This is an account of their assigned roles, rather than a claim that every submarine missile has the same targeting limits. Payload figures also need care because some positions can carry decoys to draw defences away from warheads.