Do I need to know workflows in order to get the developer? The pass rate isn't public; Anyone would venture to guess what it is?

if you have the learning portal, then the prep is almost entirely the exam. It was a ton of workflow question and generic script questions when I took it. There's 2 new paths for dev certs now so you'll have to pick one and give it a go. I dont think they've started it yet.

The dev certification (suitecloud developer 2) doesn't focus solely on workflows anymore.