I think in most cases, this doesn’t look like using 10% of your time, but rather trading off the an optimally effective career for a less effective career with that improves along selfish dimensions such as salary, location, work/life balance, personal engagement, etc.
This picture is complicated by the fact that many of these characteristics are not independent from effectiveness, so it isn’t clean. Personal fit for a career is a good example of this because it’s both selfish and you’ll be better at your job if you find a career with relative better fit.
I think in most cases, this doesn’t look like using 10% of your time, but rather trading off the an optimally effective career for a less effective career with that improves along selfish dimensions such as salary, location, work/life balance, personal engagement, etc.
This picture is complicated by the fact that many of these characteristics are not independent from effectiveness, so it isn’t clean. Personal fit for a career is a good example of this because it’s both selfish and you’ll be better at your job if you find a career with relative better fit.