is that fine if open world game that have time of day system not using dynamic GI?
do you know example open world game that doesn’t have dynamic GI?
I really can’t tell if the game using dynamic GI or not, 
Lack of dynamic GI is a big issue in games with realistic lighting/materials if there’s a lot of gameplay in buildings, in shadowed areas, or areas with cliffs and valleys. Lack of GI makes everything look much more flat and 2 dimensional.
World of Warcraft (vanilla at least) had day-night cycle and no dynamic GI.
GTAV from what I have seen must have some form of dynamic GI.
I’m pretty sure GTV doesn’t have any form of GI, just AO and reflections GTA V - Graphics Study - Adrian Courrèges