Thin client why not lean and fat

Talking about thin client, I believe that everyone will not be too unfamiliar, but when you understand the thin client hardware configuration, you will find that thin client is not as thin as expected.

Take a well-known brand of thin client as an example, you will find that its hardware configuration is not much different than the current mainstream PC hardware configuration is too far away (many places are still using this configured PC) the hardware configuration of its thin client is as follows

Search for thin clients from Wikipedia and you'll find the following definition: