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My attempt at a dummy answer--
Seems to me that the tuning of the HOT / flyback is already delicate enough under good circumstances. Adding another circuit or two for protection in the case of complete horizontal drive failure might have made the whole thing even more unreliable.
How often were there cases of complete horizontal drive failure?
Easy enough to do in the IC age (and they were probably more concerned with keeping HV/x-rays under control than protecting any circuitry)
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