Personally I keep it syncing off TTRSS for filtering and automatic actioning on certain feed entries, but that aint everyone's cup of tea. I'd like to think NNW at least covers most people's use cases whether standalone or relying off another service to aggregate.
So if you want to make news feed from news sites, you have to use parsing their html code, and ofc everybody has its own structure. JS powered sites are painful ones.
Just look at it, NNW is still using the same great design.