Yes, I totally can't wait to take more advantage of the Git back-end! I like the idea of visual diffs though they can have problems (if you move the entire design by 1mm say). Just having tagged versions will be the first step and we can experiment after that.
I have been pushing people to better document the projects and helping with getting the required files into place (and sometime helping them use Git/GitHub). I have been doing what I call guerrilla BOM building (never shout this at an airport!) where I sort out an OSHW project's bill of materials and send a PR. I was doing some of this today: [1][2]. I will be applying for grants to do more of this and maybe get some help with it.
[1]: https://github.com/prometheus-science/Flypi/pull/2 [2]: https://github.com/rwb27/openflexure_nano_motor_controller/p...