"Selling as many phones as possible" allows yearly upgrades, but instead of 10 different models per year they can sell 3 models per year with 3.3x sales of each

"Selling as many phones as possible" allows yearly upgrades, but instead of 10 different models per year they can sell 3 models per year with 3.3x sales of each model. I am looking at Samsung models on the market, they are close to 10, Apple has maybe 2 or 3.