However, it’s important to emphasise that social science has so far failed to provide definitive answers.

Yeah thats traditionally not the job of the social sciences or science in general.

In case you’re interested, its actually really easy to just grab this big Git repo of hundreds of Linux related wallpapers from different distros. Roughly half are gorgeous landscapes and you can be assured the photographers all gave explicit permission for their work to be distributed as wallpapers. Check it out!