I think the OP's point is that the Mac Pro is not a nicely designed item. Design is all about tradeoffs. In this case, Apple had to decide whether to prioritize

I think the OP's point is that the Mac Pro is not a nicely designed item. Design is all about tradeoffs. In this case, Apple had to decide whether to prioritize form factor and appearance or upgradability and performance. They chose the former, which turned out to be the wrong design for the target market.