OpenGL 3.0 has been a published minimum requirement to run Roon since April 2015. This requirement was neither introduced nor changed in 1.6 or 1.7.
Expecting Roon to test for devices that don’t meet published minimum requirements and then give special warnings about them is unrealistic.
Edit: I was mistaken about this. Roon 1.7 introduced a new requirement for mobile devices to have OpenGL 3.0 ES. See below.