Unless it doesn’t. Just because you say so doesn’t make it true.
Or even if FunCom decides that’s true it doesn’t matter. They could easily make a glowing goop torch or lantern that requires 10 glowing goop to manufacture. Or 20. Or 50. The number doesn’t matter, what does matter is that FC could add it to the game.
It wouldn’t be problematic at all. None. Nada. Zilch. It would be zero problematic. Just require more than one to make a torch or lantern, or maybe even require an alchemy process that distills multiple goop into a light source. Problem solved.
You should try googling before you reply. Candles are the oldest light source in lanterns, with oil lanterns only being invented later.
Even after oil lanterns were invented people kept using candle lanterns for lots of things. In some historical settings oil was too expensive and people kept using candles long after they had oil lantern technology. There are tons of historical illustrations (from books, tapestries, paintings, etc.) of people using candle lanterns.
Candle lanterns were extremely common for a very long time.
This isn’t cinematography, it’s a game, the logic is completely different.
In cinematography they are specifically talking about how to make candles look good when you’re making a movie, which has absolutely nothing to do with any discussion of lanterns used in a game. This is especially true when it’s a game about a fictional time period that never existed.
Making a candle lantern that works for cinematography has nothing at all to do with adding a candle lantern to a game.
Speaking of practical things, you also wouldn’t want to drink salt water to quench your thirst, drinking salt water causes madness, but in Conan you can drink from the oceans as much as you want to. You can even fill your water flasks with salt water. Having a candle lantern hanging from your belt is a lot more realistic than drinking salt water.
Hit points aren’t real.
Sorcery isn’t real.
Living skeletons aren’t real.
Lemurians aren’t real.
Bat creatures aren’t real.
…and so many other things.
Trying to use realism is a silly argument.
Again, you need to do more homework. Lanterns, both candle and oil, were used a lot in historical settings.