eGPU support over USB4 will work, as MSFT dictates that all oems supporting USB4 with W11 must support PCIe tunneling.

There are a couple of youtube videos that demonstrate this if you search for GPD Win Max 2 reviews, one such example being from ETAPrime.

Please correct the statement:

Connecting Thunderbolt-specific docks, such as eGPUs, will not be possible on the AMD version.

Note this:
https:
//www.pcworld.com/article/703578/usb4-support-amd-ryzen-6000-laptop.html

And the Information from GPD itself:
https:
//www.gpd.hk/gpdwinmax2

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eGPU support (AMD via USB 4, Intel via TB4)

AMD users, behold! The AMD version of WIN Max 2 has a USB4 port supporting up to 40Gbps transfer rate. The USB4 interface natively supports the Thunderbolt 3 protocol, so now you can play games with the AMD version of WIN Max 2 connected to a Thunderbolt 3 eGPU!


The Intel version of WIN Max 2 has a built-in Thunderbolt 4 port which can be used to connect to a more efficient Thunderbolt 4 eGPU!
*****

I wouldn't count out Thunderbolt devices on 6800U. Thunderbolt 3 devices were tested and confirmed to be working.

eGPU should work on the Ryzen 6800U per the specs on indiegogo "e-GPU support (AMD via USB 4, Intel via TB4)". I have seen two videos of eGPU's running with the 6800U over USB4.

I thought R7 was cheaper than i7.

As if Intel graphics had any chance...