You must be one of those Gall-Peters "lets make Africa look like a limp dong" map proponents.
Mercator was not made and is not used for political purposes. When it's used in publishing, it's because the square format of the projection fits nicely on a single vertical-formatted book page. If the publisher is opting for something across 2 pages, they'll typically use a reference map such as Robinson or Winkel-Tripel.
Mercator IS used in places like Google maps, because it's great for navigation.
Because everyone in corporate IT wants to marshal the forces of FOSS every time some functionality found in a stock install of $MS_PRODUCT is non-existant in $FOSS_PRODUCT.
While you have a point, the FOSS world would do better to have useful functionality in place before the world asks for it. To be truly successful, FOSS needs to be ahead of what the proprietary world is doing, not implementing some idea that somebody else invented.
In some projects, this definitely is the case. For instance, Dolphin file manager is pretty damn good, while Finder and Windows Explorer feel like toys.
In others, work needs to be done. Is the email client a truly finished product? Can nothing be improved upon? I've used Thunderbird for the past 8 or so years, and while it works quite nicely, surely more could be done.