I've honestly come to terms with it. It won't be a game-breaker without Day/Night especially since after the initial area you'll be traveling to:

Shadow Cursed Land. No sun
Moonrise Towers. Likely no sun.
Probably more dark dungeons. No sun.
Baldur's Gate eventually and most likely, which will probably be besieged with no sun.

Yeah. We're talking a lot of work for them to do for not a big part of the game, most likely, maybe, I'm assuming, and guessing, because I really know nothing.😌