This technology is totally out of logic. It doesn't make sense to keep units idle, you're wasting time / resources. Even though mercenaries can no longer collect resources, you can recover your hp in other, more efficient ways.
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It doesn't make sense to keep units idle, you're wasting time / resources.
That's precisely the point: rather than sending wounded troops back to work immediately, give them time to rest and heal, sacrificing a bit of income to save men. The trade-off seems rather reasonable.