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That's certainly true, but there's only one zone valve in the path and (in my case) there are 23 HR92s, all relying on: batteries, electronics, gears and magic. I don't have any MTBF data but intuitively an HR92 failure must be more likely than an S-plan zone valve failure (seems not to be true for Y-plan valves). If the zone valve does fail it can be locked open or decapitated.
So ... for all but small new systems I think a zone valve has value, and that decapitation (your solution) is best for existing systems.
So ... for all but small new systems I think a zone valve has value, and that decapitation (your solution) is best for existing systems.
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