I strongly agree with matt about the importance of discoverability that is currently lacking (`geiser-doc-symbol-at-point isn't enough). Its pretty hard to find out how to do something beyond the basic usage.
I would like for Guix to host a community wiki (in addition to a more discoverable official documentation). Because a collaborative wiki that encourages effortless and low quality content could alleviate the problem of discoverability and context. This could serve as a stepping stone for users to understand the context (by reading what another user tried and failed to achieve) and to find possible solutions (avoiding the time sunk of dead-ends and maybe adapting an ugly hack into a cleaner solution, or even just using the ugly hack, instead of gving up on the use of Guix). The low quality wiki could also motivate people to correct misconceptions and submit better approaches ("Someone is WRONG on the internet" https://xkcd.com/386/ ).