All in all I’m satisfied with Roon 1.6 (core on QNAP NAS, clients on iMacs, iPads, and iPhones).
I understand that you cannot adapt a multi platform software to all client operating systems optimal. But the following two drawbacks should be really removed:
Roon does not support dark mode of Mac OS Mojave. The switch between dark and light design inside Roon isn’t a replacement for the global switch in the operating system. This is really annoying.
Roon does not support flipping the orientation from vertical to horizontal and vice versa on iOS devices. Also this is very annoying (especially on iPads).