Besides being unreliable, memory is unpredictable. There appears to be no clear system. Chaos is plentiful and intentions merely wishful. It's impractical and baffling how even my sincerest of efforts to imprint as little as the four integers in my pin-code or as much as the all major conclusions in a year's worth of biology can prove almost in vain.
Meanwhile, I can recall the most minute details of several specific days of pre-school. The particular color of the grass, the smell of asphalt drying after summer rain, the games we played, and the shape of the playhouse we had.
How practical it could be to have an intentional memory manager. I really need to remember my pin-code, so let's flag that as for keeps. I don't really need to remember specific strategies, exact wordings, and '96 prices of hundreds of Magic cards, so let's drag that to the bin.
I wonder if we with intentions could do a better job, one that could make us happier and more prosperous, than with current choices of our subconscious.