Why microsoft doesn't include xbox one X in next gen games its a powerfull console

i disagree, the series s is a good few years old tech now, so is the series x. i have a series s for my youngest kid and i can definately say, it is trash compared to the pc's in my home, its slow, games are running at mostly low to probably low-medium. series x is also getting on a bit compared with the tech available these days.

An i can deffo say the PC games i play come in way above the series s and even better fidelity and framerate than series x,

Because it's last gen. It's not as powerful as the Series S/X.

but missing some of the hardware features that are required, xbox one x is ancient tech these days, even series s is now stretching, series x is getting on a bit too.

But i mean it has very well cpu and gpu can run graphics better then series s

Series S is not stretching, it’s a false narrative

PC games have supported a wide variety of abilities for decades.

The reduced RAM is because it doesn’t require it, as it’s not pushing the high res textures and meshes

You’ll find the majority of PC games come in below a Series S, before you take into account PC overhead and streamlining in a console. The CPU is identical for all intents and purposes, you’re just dialing back fidelity and bells and whistles