Since when are the two mutually exclusive? There's the business decision to make substitutions that keep the cost down and therefore the wholesale price down while also maximizing the profit. That's not necessarily greed, though sometimes it is when the product quality takes an unnecessarily substantial hit strictly to increase profits. Businesses exist to make money. But I contend a that they also exist to offer something of value for that money.
There's the greed with buyers who think they should get tobacco blends for free and who whine about every price rise, especially in the US. That puts a certain level of downward pressure on prices, which translates to downward pressures of costs to manufacturers, which leads to economies, like cheaper lower grade leaf.
Since buyers are unwilling to pay for a premium product they're not going to get a premium product. It will just a a pretend premium product. Why would anyone be surprised at this?
Sometimes substitutions happen because the original component is no longer available. What are the odds that any tobacco blender uses all the same sources they were using 5, 10, 50 years ago? Perique is still available. It just costs more than West African dark fired.
In the case of Three Nuns there was more than one formula, and yes, there was a Kentucky version that was in release, and yes, it was to cheapen the product and make more profits. So, nothing new about tweaks to and substitutions to tobacco blends.
But also, nothing by the industry acknowledging the changes. That's something of a disservice to their customers, especially long time customers who love particular blends. But then again, a lot of those customers are whiners, so maybe the industry really doesn't owe them squat.