Your concept of spoons reminds me of the Rae-Holmes stress inventory:
https://www.stress.org/self-assessments/holmes-rahe-life-stress-inventory/
There’s not as much in it about the small 1-2 spoon detracting events, but the takeaway is that the more stress points you garner in a short period of time, the more likely you are to develop health issues.
In my field (counseling) I often talk with clients about having a stress reserve that functions like a bank account. Stress, is a withdrawal, positive things are deposits.If you live with too many stressors it’s best to decrease the stressors to live within your means in the same way you might need to with your finances if spending outrunsearning. If your stress is non-negotiable, your second best option is to up your self-care. Basically the same idea as your spoons, just a different metaphor.