There are seemingly very few stability issue being reported. There are a small number of people having serious crashes, that is not good.
There were a few big bugs that should have been caught (Settings for international users). There were load issues when everyone was trying out 1.8 for the first time.
The rest are design choices. We may not agree with them all, but they were researched, explored, prototyped, iterated, tested, tweaked. I agree with you that Roon has a diverse set of Use Cases and Persona to try and meet. I am hopeful this release rearchitected the system (front and back) to make incremental releases happen faster (unlike past history).
Here is a good tracker of when Roon comments on what they are working on for 1.8.1
List of updates from Roon on 1.8 issues - Roon Software - Roon Labs Community
i have been using Roon a lot more with 1.8 and finding new things to play, both in my library and on Tidal.