I'm sure it is, but to actually utilize the barrel roll, you have to use a specific brush that supports it. A circular brush (like used in notes) is not going to be affected anyway. So, unless you're in something like, say, Procreate with a brush that supports it, you're not going to see a difference with it on or off in apps like Notes.
And sheesh, give it a chance? Why would you turn it off?