As smartphones come with barometers, new apps will improve weather forecasting

Samsung's purported rationale for dropping the FM radio in the Galaxy S4:

  Our studies show a trend shift of interest to digital broadcasting, specifically
  – focus on listening to music content in social networks or on the channel
  YouTube. The flagship model of our products are focused on customers who use
  digital content, which use modern formats and channels of information
  consumption. (translated from Russian).

http://blog.gsmarena.com/samsung-explains-why-galaxy-s4-lack...

I can't image carriers are upset about it.

Some do. Even the new $20 Microsoft Nokia 215 targeting the developing world have FM antennas and radio functionality. It's actually a wholly under-served feature ... if anyone is working on non-profit, NGO ventures.

They do, or some of them at least. Mine does.

Edit: it has an FM transmitter too.