@Klaus_Kammerer1, did your proposal ever go anywhere? Personally I find the Composition->Form/Instrumentation/Period->Performance route the potentially most useful. But I also find a lot of gaps in Period, Form, Instrumentation etc. on the composition screen and these are not user editable.
I think there is a case for multiple routes to your content so I would also support the improvements to the Composer->Genre->Album route as suggested by @Mike_O_Neill here.
I would also like to be able to switch on the “path” column in the composition screen. Currently it’s only available in the tracks screen. I am sure this would be of interest to those like @Alan_McMillan with highly structured paths. I have the impression not many are aware of this option. There seems to have been two main strategies in the past. Some used custom tags whilst others used highly structured path names. At the moment both groups are struggling to get visibility on that sunk effort in their legacy libraries in roon.