No, there is actually cancelling debt.
There is also forcing someone else to pay, but that’s a different thing.
Its probably the case that only some (such as government-held portion) of the debt at issue could Constitutionally be cancelled, in the strict sense, though.
> The incentives here are entirely backwards.
Because its not (unlike, say, bankruptcy), an ongoing thing available to people in the future, it has negligible incentive effect. Even as precedent, the expectation “if a set of debts across society becomes sufficiently onerous, they may be cancelled for everyone” creates very little incentive for anyone.