Says who? The rest of the industry?? Because nope..
I've been buying consumer electronic devices since like forever. Going back to the Pocket PC days support for newer OS/firmware would actually cease for hardware in like a year or less. Symbian OS from Nokia would support firmware upgrades only if there are faults. Same as Sony Ericsson, Motorolla etc
Apple started the trend of adding new features in firmware upgrades for years after release
Your 2 year support claim isn't supported by consumer electronics history
What are the prices to the customer for these other phones? If you will notice I said a $1,000 phone. Samsungs typically cost a customer between $100-$500 for a phone. Within a year, Samsungs typically go for 2 for $100.
Iphones are twice the prices of these other phones.
And yes, it is industry supported. Blackberry, the foundation of all smart phones offered OS multiyear updates before Apple even came into the game.