This minor wallet optimization was not even mentioned in the above rationale for the new rule. If the sole objective of the proposed rule was to save a small amount of bandwidth for SPV proofs, we would not be having this discussion. The bandwidth savings was a modest side effect benefit of fixing a perceived consensus-related security issue, which has been shown to be a suboptimal and unnecessary fix. It is not a trivial thing to add a new consensus rule, even with the assuption of a roll-up soft fork. This should not even be under consideration at this point.