You ranalogy with Stalin and the wall is perfect. As it includes the effects of the power vacuum leading to disillusion with the system(New Republic) leading to the rise/welcoming of the populist strong man(First Order).
When viewed this way the last episode had some good world building and the series over all has been consistent in this regard too as per your earlier examples.
Now to cement the idea we need to see more of the Remnants/Proto Orders ability to project force about the galaxy. The season one finale showed a bit of that power but we need more.
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