Very few people would benefit from USB-4 in their phones. They mainly use those ports for charging. The Pro phones have faster USB for file transfer but even th

Very few people would benefit from USB-4 in their phones. They mainly use those ports for charging. The Pro phones have faster USB for file transfer but even there, that is a minority use case. The M-series of chips use the same cores as the A-series but have other support chips that will have little benefit to a phone but will use more power. They just are not optimized for phone use. You could wish that Apple would put more cores in the A-series for additional multi-threaded performance but that would have a cost too and might not be much benefit either.