xbox series x thunderbolt 3 eGpu ?

An Xbox is not w PC, it is a fully integrated device. While the Wifi protocols have not been specified, it will be perfectly adequate. Anyone who cares about high speed wifi goes wired because milliseconds matter.

And any changes like that were locked down probably closer to a year ago than not

I don´t see the need of an eGPU or Thunderbolt ports for a console. The Xbox is a console which is made for gaming, streaming and not a PC. Wifi protocols have not been specified. Anyone who cares on things like download
speed should prefer the wired soloution because this will be the fastest connection.

I hope they don't put unnecessary things

I disagree, the Xbox is a games console first and foremost. It does not need to be an eGPU and I believe the cost of having a Thunderbolt port would mean resources are being put towards something that would not be utilised by that many users. I also believe
such a feature would mean something else would need to be cut in order to keep cost down.

Not sure if this will help but incase you missed the tech demo for x series here it is https://youtu.be/7Fjn4GRw8qE