Here in Helsinki, Finland(Northern Europe) my phone using LTE is 100mbs download and 10mbs upload(speedtest) inside my apartment building, outside even better. I live 5.33 km (3.31 mi) from Helsinki city centre.
Also my cellular plan costs 27 euros(about 32 dollars) a month, true unlimited plan(max 150mbs download speed).
Example month of July i was using my phone plan only(for phone and laptop) and that months data usage was 301,08 GB, bill for that month was 27 euros including limitless voice and text
About typical phone plan in Finland ?
So my feeling is iPhone download caps are there mostly for mobile network situation in Northern America