While they have been fighting to make their products more powerful and better than their rivals, they end up with something that is more expensive and not really much different.

For example, you can make something with an 8k resolution, but the human eye can't really tell the difference between 4K. And other performance improvements are less dramatic.

Sony Group launched its PlayStation 5 Pro console in mid-November. The $700 upgraded version of Sony's 2020 gaming machine uses AI to improve games' frame rate while maintaining exceptional image quality -- at least for 82 games that have been enhanced to take advantage of the new specs.

That means gamers can see the realistic glint of their metal sword and experience smooth, sword-swinging battle action.

However, reviewers were not impressed with the $200 price increase over the previous version, reviews so far haven't suggested it's a must-have machine.

Niko Partners director of research and insights told Bloomberg:  "It's an improvement, but there's nothing that makes it a complete generation above what the Series X offered."

"It's a lot more difficult to distinguish the jump between each generation."

The number of households with a gaming console hasn't really budged in more than a decade. Many gamers are replacing older machines more slowly, finding the one they already have is good enough, he said.