As professionals in the learning field, memory is central to our work. If we don't help our learners preserve their memories (of what they learned), we have not really done our job. I'm oversimplifying here -- sometimes we want to guide our learners toward external memory aids instead of memory. But mostly, we aim to support learning and memory.
You might have learned that people who take photographs will remember less than those who did not take photographs. Several research studies showed this (see for example, Henkel, 2014).
The internet buzzed with this information a few years ago: