Over the past week, I have found out exactly why cPanel and Plesk thrive. I have tried nearly every single panel out there. Not one came out of the box with SSL installed for the admin section. Let's Encrypt is a no-show on many of the panels. What?
Installing SSL is too tedious for me. I don't have that kind of patience. When I try, I always realize that I am using some old documentation that no longer works. Try to install DKIM. Forgetabout it unless you are a Linux guru.
cPanel and Plesk rarely need documentation because they just simply work! My cPanel license price is worth it to me, at least after this week.