iPhone vs Pixel: Product lineup
Both Apple and Google follow a similar philosophy of continuing to sell their older phones even when the newer ones are released. This lets them maintain a healthy list of options without needing to launch too many phones in a year. When the new phone launches, the old phone gets a permanent discount and stays as part of the new lineup, while one of the even older phones gets knocked out.
The iPhone primarily has three product lines: the iPhone SE, the base iPhone, and the iPhone Pro. The iPhone SE follows a relaxed multi-year refresh schedule, getting a refresh once in a blue moon. The base iPhone and the iPhone Pro get refreshed annually. They also come in two sizes, with Apple settling into a base size and a larger variant. When the series is refreshed, Apple usually only keeps the older regular-sized base iPhone.