It gets a little tiring....

if consoles and graphics cards had such amazing chips in them, perhaps computer manufacturers would use them in supercomputers, mainframes, desktops and laptops.... but they don't. They stick with the same old chips from AMD, Intel, IBM and so on. Why is this?

Well, it's not difficult to understand. All these claims made by the console and graphics card manufacturers are technically accurate, but totally misleading. In comparable terms, they are nowhere near as fast. Older consoles and GPUs were totally useless at general purpose computing. This is changing, but very slowly.

There are a few computing problems that can be reformulated to take advantage of the limited constraints of a GPU, and then do that small task in parallel. It's not suitable for all projects, though.

It's called specialization. Graphics cards are very, very good at graphics. Anything else is a total accident.