Will Modern Pages ever allow "Web Part Connections" (to link related lists)? How about "Filters"?

I've tested the new feature and the experience is once again very underwhelming.

So basically you can:

• Select a list item and see its properties (in a vertical lay-out, all fields under each other and yes another scrollbar inside your page).
• Select a document and see the file preview.

So no option to select a list item and (via a shared property) show all related documents in a library (you could do this in 10 years ago in classic pages). 

Apart from this, I noticed you can use 'Page Environment' as a refiner source and select 'Query String'. I tried adding a few query strings but nothing seemed to work. Anyone an idea if / how this works?