Slow iPhone? Just get the battery replaced and boom, faster iPhone. This $30-$100 repair is so much more affordable than spending $1000 for a new phone with slightly better functions.
Not to mention the ecological costs it takes to produce an iPhone. The precious metals needed to produce an iPhone are sourced from several countries, and then are assembled in China. They made a city in China that revolves around iPhone producing factories (Foxconn if anyone wants to research more)
The iPhones are then packaged into Boeing airplanes and then shipped to other countries. Why is this bad? The CO2 and other airplane fumes stay in our atmosphere for a longer amount of time
Source: I wrote a research paper on how iPhones are produced