Having copper and silver might be interesting for immersion purposes. But unless Larian add items with prices that require the use of those coins - they will be just a cosmetic addition, that will only confuse some players, who don't know conversion rates.
Agreed, I don't see what this adds to the experience other than needless complication. The only game I can think of that did this was Temple of Elemental Evil and I never felt it really added anything to the game except slight frustration.
I'm curious...since you're familiar with a comparatively ancient game like Temple of Elemental Evil (I'm assuming you're talking about the Troika remake)...have you actually played P&P Dungeons & Dragons? You seem averse to creating a game that is closer to the way D&D has been played in P&P since it was originally released. Things like this add depth. Other mechanics have come and gone throughout the decades, but forms of currency (and alignment, which we discussed in my other thread) have remained because they make sense. They may not seem like they have a point if you don't choose to think about how the world works. They may not seem like useful mechanics. They may seem only to overcomplicate things. But if you consider that most people who live in the various worlds of D&D see gold to be something of much higher value, then encountering a peasant with even one gold coin would feel strange, or uncommon at the very least. You might want to check this out:
https://www.toolsofchef.comMost people in D&D do not deal in gold. They spend their days working for copper and silver, and gold isn't something that even enters their thoughts because they're farmers and laborers who are just trying to scrape by and provide for their families. Gold is for merchants and nobles. It's treasure. I know it seems like I shouldn't care so much about this, but when I think about how people really live in a world, it just doesn't feel right to me that everyday folk would have a bag of gold on their belt, and so that's why I want the standard D&D currencies. Because it's how the world is supposed to work.