To not worry about being “efficient” in life as the ultimate luxury.
For example, to have the luxury to cook and clean yourself (slowly); this is a luxury. It is the poor and enslaved class which needs to have “working lunches” at their desk with their sad microwaveable lunches. True luxury is to do things which aren’t “efficient” (dropping your kids off at school, walking around the block, chatting with a friend unhurriedly, chopping veggies, etc).
Thus my idea:
Opt for an unhurried and “inefficient” life.
And the irony:
Perhaps an inefficient and unhurried life (insouicance in French) is the key to a more “effective” life.