From Apple's perspective Qualcomm has been insufficient for a long time for many reasons, the security issues here would only be one of the many factors involved in the decision to do their own development.
For what it is worth, a modern chip as complex as the A* series is essentially guaranteed to have vulnerabilities. Maybe not 400, but definitely not 0.
For what it is worth, a modern chip as complex as the A* series is essentially guaranteed to have vulnerabilities. Maybe not 400, but definitely not 0.