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The repair() method is pretty basic, yes. However, the main problem is one step deeper. The approach with clipping to not go beyond the limits of a given neighborhood has downsides. It prevents ringing/overshooting in those places where you don't want such. Yes. But it also prevents ringing/overshooting in those places where you do want it. Ouch#1. In both cases, the output signal is not smooth anymore, due to the possible clipping of the signal peaks. Ouch#2.
Rule of thumb: you don't want overshoot on one-step gradients, but you do want overshoot on the center of two-step gradients.
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