Repairability isn’t a significant metric because beyond battery replacement, which is very reasonably for iPhones since Apple halved their battery replacement prices a few years ago, very few phones are ever repaired.
“..researchers found that brand, an intangible property, is more important than repairability or memory size in extending the life of a product.”[0]
The article found that Apple phones last on average a year longer than Samsung’s.
[0]https://www.sciencedaily.com/releases/2018/10/181016142434.h...
Another estimate puts Apple device lifespans at 4 years 3 months.[1]
[1]https://www.zdnet.com/article/iphone-ipad-mac-heres-how-long...
The average for all smartphones is estimated as from 2 to 3 years, but bear in mind that includes many Apple devices, so non Apple devices must average the low end of that.[2]
[2]https://www.coolblue.nl/en/advice/lifespan-smartphone.html
The fact is repairability simply isn’t a significant factor in environmental impact overall. I do completely accept that wanting it as an individual right is entirely reasonable. There are plenty of solid arguments in favour of repairability, but environmentalism isn’t one of them. If you care about the environment more than right to repair, Apple devices win by a very large margin.