It’s probably the biggest issue out there. You can go into a bricks-and-mortar store, pick up an item, feel it, open it, gauge the weight, the texture, the shape. You can read the labels, the manufacturer information, talk to a store owner about it.
Let’s compare that experience to what happens online. How many times has there been just a line or two of text? No detailed description? No guidelines for storage or for washing if the item is a piece of clothing?