Would mirror-pair carriers ever have become standard?

The closing question asks what carrier history might have looked like if other navies had copied the Soryu/Hiryu mirror pairing. One of the Yorktown-class ships or a second Ark Royal could have carried its island on the opposite side so paired carriers worked as matched sets. The arrangement is judged an unworkable standard, especially as carrier islands became larger and more obstructive. A mirrored ship also tied human-factors risk and internal machinery compromises to the expectation that its intended partner would be available. The alternative was to build self-contained carriers with a consistent layout and let doctrine combine them as circumstances required. The counterfactual tests the ships' most visible novelty against standardization, flexibility, and crew safety.