Maybe designing and implementing 100% solutions for Scheme would be a good goal for a community of practice.
It would be an excellent goal, as mentioned in >>11 this is one of the defining characteristic of the Lisp philosophy. Unfortunately, also as mentioned by >>11 the Lisp philosophy is far weaker than it used to be and seems to only persist in lone hackers currently. Olin Shivers is an example of this and so is Verisimilitudes with programs such as http://verisimilitudes.net/2017-12-31 (M-x shr-render-buffer to render in eww) To have such a virtuous group as these individuals would be extraordinary.