Not to mention that Helix has more RAM, compute units, power draw, higher clocks, different node. The theoretical 40 % power difference between PS6 and Helix makes sense, but it could be 5%-15% due to lots of windows overhead and bloat.
I think MSFT has to make a more powerful console due to several reasons:
-They have already lost the console war, so if the consumer were to compare helix to ps6 that's the one thing going for them even though it may not matter much at all
-Xbox One vs PS4 totally destroyed MSFT: Lower TFLOPS, DDR3 RAM with a shitty ESRAM to boost bandwidth, kinect bloat made PS4 the choice for third party games
-By the time Xbox One X came out, it was too late despite better at everything and '4k' gaming. To add fuel to the fire the series S made things even more confusing with 1080p gaming.
-PS5Pro made series X loose its 'most powerful 4k gaming' crown
I think the goal of Helix is to: 1) shut the door on console gaming for good for MSFT as a company 2) transition phase/step for xbox console gamers 3) Build games for the windows ecosystem. 4) Break the cycle/curse of hardware refreshes every 4 years for upgraded graphics.