So I like CSP, I do use it occasionally, but my biggest problem when I bought it (which was a while ago) is that a lot of the brushes and tutorials just...aren't in English. So, because I have to buy Photoshop anyway for a majority of my work, I use Photoshop. CSP isn't really a requirement for comics though--you can make comics with pen and ink, after all (and a scanner of course...to put it on digital.)
Another thing is that the font tools are just...pretty bad. They're getting better, and I think CSP is almost there where I can actually use it for a page start to finish, but I mostly use it for when I want a certain quality of linework or if I want to use their other tools like their paint bucket and their brushes that allow me to use like stickers for flora and other detailing (which is not a thing in Photoshop because I think Adobe is trying to pivot illustration needs to Fresco--I don't really fully get Adobe's deal right now. It's a mess.).
Overall, though, as much as I've listed complaints--a great program. Especially for people starting off. They just need way better tutorials because there are some things that I cannot get to work although I am using the same brushes and honestly, it's because my brushes are the Japanese version and I don't know what they say.