This is why Apple's Mac Pro "Trash Can" was a total failure.
Just before Apple released the 2013 Mac Pro, it was long overdue for the tech giant to bring out another version of their workhorse. The Apple Mac Pro is an essential tool for people who need function and processing power over anything else, such as for video editors, graphic designers and for people specialising in animation and 3D animatics.
However, after the release of the 2013 Mac Pro, nicknamed the Trash Can, it soon became clear that Apple had spent more time on its form and not on its function.
The Mac Pro quickly became more of a pain for users due to its limitations on expandability and problems. The Trash Can had a maximum of 4 RAM slots, which is enough for most people, but for some, this wasn't even close to enough. The GPU's were very constrained, and Apple built this Mac Pro in such a way that it was incredibly difficult to install any updates. Apple seemed to be overly confident in their "set it and forget it" mindset.
Take a look at the video below by YouTube channel, Tech Insider, on Why Apple's Mac Pro "Trash Can" Was A Total Failure.