For me at least, it's quite on the contrary, there are few viable cases for content I wish not to consume via RSS.
Some of my reasons are:
1. Having a central place where I can keep track of my my reading lists.
2. Offline first (download for later use is the default behavior)
3. Deduplication - for advanced use cases such as messy web feeds, where ordering is far from guaranteed, a well defined key can reduce the clutter significantly.
Is that really "widespread/mainstream" though? Podcasts listening is pretty huge; in the US "38% of those age 12+ in the U.S. are monthly podcast listeners" (ref: https://www.edisonresearch.com/the-infinite-dial-2022/)
Some of my reasons are:
1. Having a central place where I can keep track of my my reading lists.
2. Offline first (download for later use is the default behavior)
3. Deduplication - for advanced use cases such as messy web feeds, where ordering is far from guaranteed, a well defined key can reduce the clutter significantly.
4. Advanced filtering (Newsboat is great at that)