Part of the problem is that Guix can be used as an Linux distro and a package manager, and the package manager is highly configurable with various channels. So your "entry point" to Guix might be different from other people, depending on how you want to use it. I think the Guix homepage does a pretty good job of providing resources for general purpose use cases. It seems to me that if you are using the HPC channel, you are not in the group of people who use Guix for general purposes.
The reason why is because there are multiple channels for packages. I recommend you use Guix command line tools to search for packages, rather than using the websites, because the Guix command line will search all the channels that you have access to, rather than you needing to know which channel provides which package and searching the channel website.
guix package --search='name-of-thing*'
> "Guix extremely relies on info pages. But that is not well known to 99.9% of world population."
For what it's worth, I really love the Info manual pages, it is very easy to find all the information I am looking for in this documentation, as long as you use Emacs (which I do) or the stand-alone "info" CLI utility. All you need to do is use the search features: index search (press "i" and type your query with tab completion) and menu search (type "m" and type your query with tab completion). The "index" is the index of all keywords in the manual, it is good to use if you do not yet know what you are looking for. The "menu" is a list of all documentation subsection titles, it is good to use if you already know what you are looking for.