I prefer not to use casings..I get my different flavours from mixing different bacca toghter...
This. If I only had one type or maybe could only get my hands on something not so good then I'd case. I experimented initially with casing but invariably always gravitated back to well fermented leaf.
Here's a tip, Don's leaf is in vapor proof bags with enough moisture to slowly improve. Get more than you need of each type and just try to put some up each time you order, still sealed in the vapor proof bags. It arrives good, but, wow what a treat to break into one of the older bags once in a while.
I got way more of the red flue cured then I'd need for pipe smoking, I probably use less than a pound a year, so if I keep adding a few bags here and there I'm going to be in heaven after a few years.
Yeah casing is not necessary.
If you are casing to tone down a bite or something of that nature, you can also accomplish the same goal with blending too.