That’s generally for UPC’s labels and is part of the reason but... There are thousand's of different adhesives that react differently to the material you are placing them on. Most companies don’t do a ton of due diligence on what adhesives are removed the best because it’s not typically a big concern
labels normally are harder to remove than not, because it’s preferred for the company. If your label contains legal information about risk of use or any other important things of note, you need to be 100% certain that the label remains on your product throughout the entire shipment process. Couple that with the myriad of different surfaces you may apply it to, it’s better to be safe than sorry. It’s also cheaper to purchase material in larger quantities, so often companies will leverage the same label material and size to reduce costs.
I normally wouldn't upvote a comment as simplistic as this one but it's Lemmy so I'm still on an upvote spree and also because I too love your username! :)