Why don't more Cybersecurity Professionals use Qubes

Maybe they not as l33t as they claim to be?

I was disappointed the book “Extreme Privacy” makes no mention of Qubes. It’s good he’s pushing people to linux, but to use Ubuntu, and I guess kept all recommendations at a basic level, made me wonder the extent of experience. Maybe he didn’t want to overwhelm, but I got the impression he’s a bit light on multiple topics. I didn’t agree with a number of his suggestions, but that could just be a preference difference. Still a good book though, I recommend it as a starting point.