I don't even know where that blob came from. Was that someone who created the Star Charts idea of a joke or something?
That blob is where Canopus is located in the real universe, and Canopus is a secure area for the UFP Starfleet to hold wargames in "The Ultimate Computer", back when Klingons definitely wouldn't have allowed for any trespassing.
The
Star Charts proceed from the assumption that the various vague onscreen graphics indicating Klingons and Romulans to the lower and upper right of Earth (as viewed from galactic south, that is, from atop the galactic disk, and with the center of the galaxy towards the top of the map) are correct - and, further, from the "small sandbox" assumption that places the (near borders of) said evil empires fairly close to Earth, i.e. closer than Canopus.
On a more fundamental level,
Star Charts wants to portray the UFP as a collection of haphazard pseudopods, blobs and oddball protrusions, to emphasize its nature as a "benevolently" expanding empire, as opposed to the conquest-minded ones that would never risk acquiring a star system far away from their minimum-surface-area outer border, out of fear of rebellion or counter-conquest.
In practice, the
Star Charts map represents but a cross section of the UFP, either at the "height" of Earth, or at the "zero height" of the galactic plane (those differ from each other by just two or three sectors anyway, that is, about 50 lightyears). So Canopus is reached by steering "above" or "below" the hot spot where the two evil empires and the UFP clash . And the shape of the Romulan Star Empire reflects the idea of a very simple border shell being dictated upon the pointy-ears when they lost that old war, while the more freeform Klingon border is the result of their conquests, and even features a "splash" where they hit Romulan space and probe around it in an attempt to find a weak spot...
As for the "speed of plot" issue, there's actually very little of that in TNG. If the ship gets to places in minutes, it's because she was already almost there to start with. TOS has some outliers in that respect, but not too many. DS9 mainly features inconsistencies in the sense that the runabouts are supposed to be slow (the early episode "Dax" indicates that warp five would be a sufficient speed for a getaway vessel that would allow enemies to escape Sisko's best pursuit), but the offenses there are minor as well.
VOY introduces the idea that long distance travel may be slow even when short distance travel is fast. But that has been naval reality ever since the invention of steam power: you have to conserve fuel and spare your engines on long trips, and can only do sprints on short ones. Warp drive just takes that to certain extremes.
Star Charts assumes, like VOY, that a thousand lightyears per year is good going in the wilderness, but that a thousand lightyears in a week is possible if you can count on there being a repair shop at the other end because your ship will certainly fall apart as the result of all that speeding. This allows Starfleet to hold wargames at the real Canopus (about 200 ly from Earth) while still having the evidenced problems with patrolling a "core space" perimeter that may be even closer than the distance to Canopus.
To be sure, the above map has never been part of the canon Trek universe. Other parts of
Star Charts, such as the
Voyager route map, are canon; yet others are more or less 100% consistent with it. And some are grossly outdated by newer evidence from recent movies or the later seasons of ENT! But the shape of the Romulan Neutral Zone has never been established in entirety, nor its relation to Canopus. All we do know is that Gamma Hydra is on the Romulan/Federation border, and that's another real star correctly placed in the
Charts, actually more "to the left" than Canopus. If Romulan space stands between Gamma Hydra and the nearest Starfleet starbase as established, then having a Federation presence at Canopus but a Romulan presence between Canopus and Earth is consistent with the onscreen material.
Timo Saloniemi