Storms in trailers are visually striking but mechanically ambiguous. We work through what the trailer evidence supports as a system.
What dynamic storms would mean
Visibility reduction during weather. Vehicle handling changed by rain. Flood accumulation altering traversal. Wildlife behaviour changing. NPC density shifting.
Some of these RDR2 did. Some are new ground.
What we can read from the trailer
Visually convincing storms. Flood imagery that looks dynamic rather than scripted. No clear evidence either way on mechanics.
Rockstar tends to ship at trailer fidelity. If the trailer storms work like trailer storms, the system probably works.