I didn't ignore your reasoning, I acknowledged it and said it was not insightful.
Unused CPU instructions are difficult (but not impossible!) to deprecate for completely different reasons than the critical functionality of line discipline that is used all day every day and for which nobody has proposed a viable alternative.
Unused CPU instructions are difficult (but not impossible!) to deprecate for completely different reasons than the critical functionality of line discipline that is used all day every day and for which nobody has proposed a viable alternative.