I've met a lot of hardcore people way up in the tech hierarchy that rock MacBooks. Like people who maintain popular languages, people who make kernel contributions, people who design CPUs and accelerators.
There are many knowledgeable people who willingly make the choice, understanding the tradeoffs and accepting them. Some people don't want to be fucking with Arch or Kali for hours, or auditing their smartphone's firmware, for the same reason most combat veterans don't walk around wearing a bullet proof vest and a rifle.
Will you meet some hardcore hackers who won't upgrade the kernel until after they audit the changelog of both the kernel AND the compiler they're using? Sure. You'll also meet some people who live in a bunker. They have their valid motives for doing so, and people have valid motives for not doing so.