And there couldn't be reasons to buy a phone that includes hardware made in China which thus runs firmware components made in China. So long as you don't have to work in a cobalt mine yourself, who cares about non-security benefits right?
Fairphone has a transparency report on their website about the manufacturing and supply chain which nearly entirely only provides a list of the companies, the location of their HQ and a link to their website for a subset of the companies. There's no information provided on the working conditions, pay or environmental impact of the supply chain. Past posts with vague details about this were mainly about their original ODM and they switched to 2 different ODMs since then. T2Mobile is their ODM since the Fairphone 4 and there's nearly no information available about it. Why did they switch ODMs twice and how do they compare? Is the supply chain for the T2Mobile-made devices more sustainable? Are they still prioritizing the ethics of the supply chain? None of that is clear.
Fairphone is marketed as being a sustainable device with good long term updates and an ethical supply chain. However, the updates are very poor from the beginning and get much worse over time. It isn't clear that the marketing about the supply chain is much more accurate. Pixels and iPhones get much better updates and hold up better over the long term. It isn't clear whether a Fairphone has better working conditions than an iPhone and it's quite possible an iPhone has lower overall environmental impact per device mainly due to the efficiency of scale.