With all of the security issues surrounding Intel CPUs in the last couple of years, not having an Intel processor will be a real advantage for Apple. And competition is a good thing.
That chart doesn't include Apple's implementations, but they were some of the relatively few non-Intel CPUs to be affected by Meltdown as well as Spectre.
Those are kind of fundamental to multicore / multithreaded CPUs, not just Intel. If I have many tasks running on the same CPU, tasks can interact in complex ways. That can leak traces of information, and a clever enough person can pry that tincan open.
Not much one can do about it, other than running untrusted tasks in a sandbox with very well-controlled performance. That means slow performance.
