cPanel has the security reputation of pre-3.0 Wordpress. It's a real-world, actual problem; in a shared hosting environment, cPanel adds a lot of risk for your customers.
cPanel is popular, and it solves a lot of problems for a lot of people. Because it's so common, people who don't otherwise know their way around web hosting can feel right at home when using cPanel. I don't have some kind of irrational, hipster-esque or elitist hatred for it; I simply think that I can't in good conscience install it and knowingly put my hosting customers at risk.