[runjake]

You've "read" wrong. The NT kernel has seen major changes up through and including W10, including focusing on power management and efficiency, improving modularity, and memory use.

It seems like your comment was meant to troll, but in the odd chance you're interested, you can follow a lot of these changes and the decisions behind them where Microsoft documented the process on the old Engineering Windows blog, and well as more recently at the main Windows blog itself.