François Piednoël, a former Intel engineer, told PCGamer that Apple has become unsatisfied with Intel processors since the introduction of the Skylake architecture in 2015. The report states that Intel’s Skylake processors had several problems at the time, and that Apple was the client with the highest number of complaints about the architecture.
"The quality assurance of Skylake was more than a problem, it was abnormally bad. We were getting way too much citing for little things inside Skylake. Basically our buddies at Apple became the number one filer of problems in the architecture. And that went really, really bad."