Brains are powerful but they are also very energy demanding. A chess player can burn 600 calories for a 2 hour game, equivalent to a 2 mile run.

Basically what happens is that our brains learn to conserve energy and save stress. If you train your brain up to remember details, it will be better and more consistent with that part, but otherwise, unless some pathways are consistently used, they stay inefficient. It is

important to note that human brains, are incredibly powerful, we develop language, motor, spatial and social skills that are very advanced. But they are geared for survival, not for optimal function.