Aside from the weight issue and components needed to craft them, which sounds like they aren’t perfected yet, I think this arrow addition was a bad idea with the current bow mechanics. They should of launched the update to bows first before introducing these utility arrows. Not that they are a bad concept, but its essentially like Oscar said about introducing new weapon types into the game bringing imbalance to the rest of melee combat.
A few things about them and the old arrows
-arrows in general should not dictate damage by any large amount. At first they should start to scale a little to give higher levels a the damage increase they’d expect but at razor arrows it should shift from damage to utility. The various components for different arrows should change what their purpose is for, or offer small variations in exchange for different materials to give various regions the same access to end-game quality arrows.
-Light arrows should probably weigh less given their limited use, and should stick to enemies. This would help identify them in dark areas better but also could help as a sort of “focus target” system for groups.
-Explosive arrows seem alright, if they behave similar to how Joel said he wanted them to act as explosives that can be ignited by enemies if you are carrying them then it’d be perfect. The heavy weight balances the fact that they can be very abusive in combat.
-Poison arrows also seem ok given they are not practical in close range combat, excluding those with a gas mask of course.
-Tar arrow should behave like tar orb, plain and simple, but the concept seems dumb to be perfectly honest. There is little use in shooting tar at someone, even if the fire arrows worked. Tar orbs sort of make sense but how does an arrow spill that much tar anyways?
As far as Hardened steel, star metal, obsidian, dragonbone arrows, etc, I think these should be equal in use to razor with small variations in weight, concussive damage, and penetration. For example, star metal arrows should probably have more penetration than the rest given their high cost while hardened steel should deal only slightly more penetration than razor but the same damage. Ivory could simply be a variation of hardened steel for crafting purposes, but anything after razor should just be a small change in function but not necessarily the next tier. Ivory just being a variation of iron and fire, fire eventually being fixed to actually ignite tar, etc.