Earlier quoted context omitted.
Yes, but that still has little bearing on actual cooking skills, no?
Knowing how to go from whatever is fresh today in the garden to a meal is a cooking skill, yes. And how to preserve gluts of fruit, also a skill.
does that affect your cooking skills in any way?
In fact, if you divide your time between growing your own produce AND honing your cooking, both of those skills may suffer
compared to devoting your time to just focusing on one ability.
Otherwise if you try to do everything you'll never be as good as a full-time farmer or a full-time chef.
or how about another analogy:
Say one day your idea for a dish requires softer or sweeter carrots, etc, but oops you spent the last season only growing crunchier and mellower carrots, what're you gonna do now? With external suppliers you always have a wider choice of ingredients better suited to the end product you want at any given time.