The projection stops around 1941 because each divergence changes the conditions for later decisions and operations. British and French strategic doctrine provides a basis for the earlier scenarios, including a British harbour strike at Taranto. As those changes accumulate, following their interactions requires more than extending one narrative. Wargaming would be the next step for exploring how the altered forces and choices affect the war.
Chapter · 1:37:59-1:38:46
Where the counterfactual becomes too uncertain
The scenario stops near 1941 because later changes build on too many uncertain earlier decisions.