Dr George Hess has written a review both of Dorico 2.2 and Groove Agent 4 for School Band & Orchestra magazine, focusing on the improvements in both applications for jazz musicians:
Each new feature is implemented exceptionally well. What has become clear is that Dorico is combining both power and ease of use into one program. It’s also clear that Steinberg is committed to supporting the program. As a jazz composer/arranger, I appreciate both the attention to my needs and how well they have implemented them.
School Band & Orchestra Magazine: Steinberg Does Jazz (10 January 2019)
http://sbomagazine.com/technology/6414-steinberg-does-jazz.html