Speaking of Horizon and unclear numbers, I didn’t realize until like 20 hours in that stacking the same mods gave diminishing returns. This isn’t exactly hidden since you can see all the damage numbers but it’s not really noticeable until you get better mods and equipment with more slots. For the early game I just did the easy math of 15% + 10% = 25% and trusted that result because why wouldn’t I? It’s not until later when you can use 3 +33% mods and clearly see without doing the math that the bonus isn’t 100%.
Luckily it’s not the biggest deal for a game like Horizon, but the higher difficulties can get pretty tricky and I wish I knew earlier that diversifying got better results than min-maxing.