You could argue that - but, as I said, that essentially logical argument does not indicate that there is necessarily a 'pressing need' to phase them out.If you believe that they would not be allowed were they to be considered as a new invention, subject to sound engineering judgement, then logic and reason should lead you to believe they should be phased out.Agreed. However, I presume that 'they' (and probably many/most of us) also believe that there is no pressing need (certainly not any evidence-based need of which I am aware) to not allow ring finals to continue to be installed.
Don't forget that, unless there were all sorts of changes in the rules, your proposal would presumably result, throughout a period of several decades, millions of EICRs (or whatever they may come to be called in times to come!) 'coding' the presence of (no longer compliant) ring finals.
Kind Regards, John