I am guessing the lucy table just combines it all together. The dev says a 40 delay weapon at level 60 gets a 23 damage bonus for 2h weapons.

You could say Main Hand Bonus + High Damage Bonus = 11 at 60 for all weapons. Then you add the 2h damage bonus when wielding a 2h weapon.

23 + 11 = 34, which is the correct value for 40 delay 2h weapons on the lucy table.

No, that's wrong. The main hand bonus damage was already 11 before the "high damage bonus" was introduced (if such a thing did exist). It also seems like the high damage bonus should apply to offhand weapons, but that part is even more nebulous.

I'd like to see some evidence for what the High Damage Bonus actually is, and if Main Hand Bonus by itself was 11. It is too much of a coincidence that 23 + 11 = 34, which is the correct damage bonus for a 40 delay weapon on the lucy table.

That would make sense. It sounds like the damage bonus shown on weapons was only the additional 2h dmg bonus.

One confusing thing was reading about the "bonus" field showing up on 1handers as well. Like it showing up as 3 on a wurmslayer for a lvl 35. Now it makes me wonder if that was a bug with wurmslayer or the delay based bonus applied to 1h as well.

There is definitely precedent for features being implemented but unwittingly turned off for some reason so that's a possibility. But the clarity and certainty of the developer description is compelling. I bumped here in case anyone else wanted to research.

Damage bonus is 100% applied to 1 handers. It's a flat bonus and doesn't increase based on delay. It's the first row included with the lucy data.

I'm not disputing that. What I was confused about is the "Bonus: X" text that showed up on weapon stats sheet at some point in era. For the two handers, it seems to be describing the 2-hand bonus (without the main hand bonus). As such, this bonus text does not seem to appear for 1-handers. However, confusingly there are reports of it showing up on the Wurmslayer stat sheet.

In the post I call out in particular, a level 35 ranger reports the stated damage bonus text on Wurmslayer is 3, which coincidentally matches both the expected main hand damage bonus and the expected delay-based 2 handed damage bonus if Wurmy was a 2 hander (i.e. the lucy number minus the main hand bonus).

Why the bonus damage text showed up on Wurmslayer in era is a bit of a mystery. Was it a Wurmslayer bug or is it something else?

That's simply the main-hand bonus, which existed from the day the game was released. It's why the Mosscovered Twig with 10 delay was overpowered when it came out and changed to offhand only, nullifying its power.

There is allegedly a "high damage bonus" that was added in addition to this, to all weapons of a certain damage rating. But there no information anywhere on what that bonus table is. We only have the bonus table for two-hander damage, which is another separate modifier and scales based on the delay of the weapon.