>"Imagine trying to explain to a hiring manager that you were fired because you planned to quit. Unfortunately, no one will believe you."
If you are a decent person who can solve problems in the real world, you don't have to worry about explaining yourself to anyone. Ever.
However, the bean counters and glad-handers who stand between you and a paycheck often ask difficult but irrelevant question, and if you don't worry about explaining yourself to them, you make it much harder to get that paycheck.
You get a lot farther with the ability to solve real-world problems and MBA-appropriate skills than with just the ability to solve real-world problems, if only because there is such high demand for technically inclined people with people skills and business skills.