Saying they've "never been able to" is a kind of weird perspective. They're really only just starting on their dedicated GPUs. The Alchemist architecture is their very first attempt, and they've been putting a lot of effort into repairing and refining the drivers. The hardware is actually pretty decent when it's firing on all cylinders.

But Nvidia and AMD have a huge time advantage on Intel. It's going to be a few generations and billions of dollars before Intel can catch up, assuming they keep with it.

Intel has been in the integrated GPU market for awhile but with little pressure to innovate and very different design goals.