Single source of truth of opinions can be challenged and changed if one's arguments are good enough. The benefit is that it's easier to see the advantages and disadvantages for those opinions, because they're all in the same place.
This is in contrast to C++, where one organization creates a set of guidelines, another organization creates another set of guidelines. Valid arguments of critique in one organization are not seen in the other.
Single source of truth is also beneficial to compiler authors as well, because they get more feedback how the language is used and why.
