Sure, but it's still a clumsy and wasteful solution since 1080 + eGPU is like over $800. Might as well spend $500 more and build a proper gaming desktop.
Like Guess Who and Dreams-Visions have said, a lot of people (me included) would rather have one, capable computer than multiple computers for multiple scenarios. Besides, if you're going to spend money on a premium notebook like this, might as well have it be capable of being your main.
This is why the lack of Thunderbolt and the use of an inferior CPU (U quad core at $2.5K) make Microsoft's comparisons to the MBP all the more baffling to me. They clearly have different priorities than Apple as the 15" MBPs actually have HQ CPUs - with the fortunate side effect of being able to keep decent Turbo speeds for extended periods of time when paired with an eGPU due to the extra thermal headroom provided by the lack of dGPU utilization.
The idea of a premium, thin and light notebook with a powerful CPU (for a notebook) that I can plug into an eGPU when I want to game and be less CPU-limited than by your average notebook is appealing to me, and is why I'm moving away from my desktop rig and to a MBP (or whatever notebook checks the boxes I want better than it) when I graduate and have the money. By that time it'll probably have PCIe 4.0-based Thunderbolt 4, making the bottlenecks even less of a concern.