Brian has explained that a folder view would be detrimental to Roon in the thread linked above on music file management.
As Brian also makes clear in that that Roon is not closed to user comments and is evolving the product to meet the use cases of those who would like a folder view and many other things. However they are not going to do things that will “break the product” or stop them doing other things they want to do in the future just to please some.
So there is little point in repeatedly requesting a folder view simply because I want it or because other products have it - it is very unlikely to come. However if you continue to explain what you are trying to do and what you use a folder view to do and why you think you need it then you will likely find that down the road Roon finds a better way to do what you did with a folder view and eventually you wont miss it at all.