Larian Studios Forums Baldur's Gate III Baldur's Gate III - Mega-threads and Guides Day/Night Cycle

Don't waste everyone's time making spurious claims and then pretending to drop the burden of proof on other people.

THERE IS NO ENGINE LIMITATION. They have public demonstrations on the current version of the engine managing dynamic variations in lighting just fine, for once. And that's without going into the fact that no one was necessarily asking for it to be "dynamic" to begin with.
Not to mention even modders with limited access to advanced functions managed to implement rudimentary forms of a day/night variation with the previous DOS games using less advanced versions of the same engine.