These wouldn’t necessarily impact gameplay, but would be nice for immersion and refreshing visuals
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Changing seasons, day and night; basically some variation during a match. optional: bodies of water freeze in the winter, opening up new places to attack through. Occasional storm events, fog?
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When you group units together, it creates an Army that you can customize visually (i.e. unique coat of arms, designs, etc). It then gets flag-bearers with customizable designs/textures (hint: modding!). Perhaps make the armies nameable
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Leave corpses, siege/artillery wreckage, flags from battles in landscape for as long as allowable with current-gen computers
*HUGE herds of wildlife (perhaps instead of hunting single animal, you can hunt a herd)