We are not sustainable
And neither is any other device maker. This industry is full of "feel good" messaging, but generates 50 million metric tons of e-waste each year. We believe the best way to reduce environmental impact is to create products that last longer, meaning fewer new ones need to be made. Instead of operating on feels, we operate on data and actions. With funding from Intel, we commissioned Fraunhofer IZM to do a detailed life cycle analysis (LCA) on Framework Laptop 13 to help us understand where we are today and where we can continue to improve. Check out our thoughts on reducing environmental impact and download the LCA report here...
My experience with Linux on my Framework has been pretty good but admittedly not perfect. If you want an idea you can check out the Arch Wiki's Framework page. Personally I think the repairability and upgradability of Framework outweighs the marginal increased Linux support you get with System76 (assuming they have no issues), but Linux isn't as big a priority for Framework as it is for System76.