Well I for one just think they didn't think of it... I took this from Starwars.com - five things you didn't know about the Millennium Falcon:
- The original design wasn’t a hamburger
The initial look for the Millennium Falcon was much different. What was planned actually became the prototype for the Tantive IV. After the crew realized that the design looked too similar to the ship from Space: 1999, they had to go back to the drawing board and come up with something else in a hurry. Joe Johnston worked on the redesign, and that’s where the hamburger came in. Johnston told Starlog Magazine, “It was the quickest ship we’ve ever done. The Falcon was designed in one day. We took some components from the blockade runner, like the cockpit, and stuck it on the side of a big dish with some mandibles out in front.”
and yes while it does start with "not a hamburger" it does go on to say -
“It was the quickest ship we’ve ever done. The Falcon was designed in one day. We took some components from the blockade runner, like the cockpit, and stuck it on the side of a big dish with some mandibles out in front.”
Not a lot of thinking about angles and the ability to see the other side of the ship...
But who cares! It still looks great and is, I think we can all agree, the best ship in the Star Wars universe.