Self-sufficiency in that sense makes you less productive and makes you end up with less network and capital.
Discussion
Hardly anyone can be self-sufficient. However one can strive for increasing resiliency.
Yes. Will be more apparent when someone gives up earning sats, to focus on spending a summer growing enough tomatoes for 10 jars of spaghetti sauce.
Isn’t there also often a multigenerational nature to effective non mechanized agriculture? So we need to stop being transient, and find a way to be graceful, forgiving, and get along with our ancestors and children and in laws. Or else marry better within an aligned set of values. This is a different direction than the world has been going.
Regeneration is low time preference, yes, and to regenerate you don't really need heavy mechanisation all that often.