I’m assuming the next fairphone will push the envelope of modularity? The most desirable of course is to be able to choose what modules you will need and this obviously should reflect on the overall price, “the less you need the less you have to spend” thus more people will be able to afford the phone which is still a head above the budget range.
For example a chassis that can be “extended” to house a bigger screen, an option to have a front facing camera, NFC, fingerprint scanner, these things are not essential but desirable. I think it is a fair challenge.
I’m aware of how the rapid ageing of electronics has become a norm, and thus its impact on the environment took its place as a lesser of two evils, we stop or we move… okay we move. Recycling is the way out, absolute recyclability is far more realistic than putting a hold on the current speed and scale of production of electronics. But also awareness in the world of incessant competition, the polluting factor should become one of the specifications of the device and be part of the overall review score. I can see it happening in a few years from now.