Related, sometimes I wonder if for instance some products I buy today have exactly the same taste today then in the past or if it slowly changed without I was a

Related, sometimes I wonder if for instance some products I buy today have exactly the same taste today then in the past or if it slowly changed without I was able to discern it. For instance I wonder if a KitKat or Snickers has the same taste today then, say in 1980, given methods, norms, factories, productions,... have certainly evolved. Or how to keep something the same when everything changes.