> Seems like all these other factors should matter too!

The way I read it was that there are some minerals that are no longer there to begin with because they're simply not in the soil. For nutrients (like vitamin C) created as part of the growing process, speed is the only factor that matters.

So yes, it does matter but unless you have a way of knowing which farm(s) the produce came from and what their soil mineral content is, that's not something you can factor into your purchasing decision.