Ultimately cases like this should be evaluated based on whether the
final result is more clear overall.
What about protecting the installed base for the existing spec?
In other words, your "based on" contains a single criterion, for an
environment that typically requires multiple. And the current situation is
certainly one of those.
Changing the specification makes sense when it does not yet have much
momentum, or when the problem is basic and severe.
For technology that has been in widespread use for 10-30 years, and an
extremely small number of problem reports, changing the specification looks
like exactly the wrong decision.
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