A good personal example for me would be Amazon... Maybe it's just my imagination, but it seems like they have less actual products on hand then they did a number of years ago. Or maybe it just seems that way, because there are more third parties selling through them now. But at any rate... In the last couple years, I've had them do a thing where it says it's coming from them and in stock, then it's obvious that it's really not. That doesn't happen on everything, but it does happen. I go out of my way to pick items that are coming directly from them and in stock whenever I can. In one instance, I actually picked an item that was a few dollars more than a third party, just because it came from them. Then it didn't. It's not a huge deal... You still get the free shipping and everything. But it's just one more thing to have to be around to accept when it shows up. And they also break down the billing on the different items, which is a pain in the butt to fix in your register when you're doing your bills.
So not the end of the world. But for me personally, I don't like that.