Isn't that a bit misleading, when it makes it seem that it's only a generic mutation matter, and that that exception to the norm is much more common than it is?
The extreme ends of that very interesting and informational infographic represent the normal situation, which is proportionally inverse in dimensions, if one considers the infographic area, if not more.
Of course, the exceptions to the norm are very complex and with all those variations, and deserve equal respect.