All good points. When I initially wrote those docs the aim was to guide the very technical few who wanted to beta test Heads through the complicated process of compiling and flashing it. Then when we started offering pre-built firmware I updated the docs to reflect that process instead.
But you are right, especially now that we are offering PureBoot as a pre-installed option, we should probably revisit those docs and focus more on average users and day-to-day workflows first and move the more technical how-to-flash or how-to-build docs further down. Fewer and fewer people will be going through the initial setup compared to going through the standard workflow.