What exactly is being referred to in the metaphor of MP depletion?

Example

  • When you’re working on a project with no finish line in sight, something gets lost, and you lose the energy to move forward.
  • Tasks that take a long time to accomplish are unbearable without MP. - Is the MP metaphor appropriate?
  • When MP is reduced, the antenna that gathers information from the surroundings stops working.

This page is auto-translated from /nishio/MP枯渇 using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.