The "fatigue" aspect can be covered by a Force-user spending Strain to convert a Dark Side pip to a Light Side pip in this system, since Strain covers both mental and physical "exhaustion" rather than being purely mental.
The only reason "fatigue" really exists is due to ESB when Yoda exhales, looking tired after he floated Luke's X-Wing out of the swamp. In just about every Star Wars RPG, there's no mechanical reason why a Jedi Master would be "fatigued" after doing such a thing. Personally, I viewed Yoda's reaction in that scene as being more exasperation with Luke's "that's impossible" complaints and that he needed a big display of power to break through Luke's preconceived notions.
There are plenty of other examples. For one thing Luke is huffing and puffing in that very scene, and for another extended media outside the film often depicts Jedi as quite tired after they've been concentrating on a given power for a long time.