Possibly true, but it can be difficult to get colder season crops in say in the northern summers or warm season crops in the southern winters.
As we are no longer hunter and gatherers, and typically don’t grow all our own produce, we have an expectation to get most basic produce all year round.
We also want other stables such as wheat, rice etc all year around as well.
This is why there has been much work done on processing/storage to facilitate longer periods of availability.
There is also research that some forms of storage (e.g. freezing) retains nutritional value of the produce better than buying and eating a few days later.
So processing and storage can have its benefits. It can retain nutritional value, reduce waste/spoilage, better suit customer needs etc.
