What makes people complain about current Duskblade so much?

I haven't seen people complain about Duskblade until now. Duskblade is an item that had three different versions.

The first was one that had flat armor pen (lethality didn't existed back then) and a passive that was like a mini-Zed ult that did damage based on a percentage of the enemy's missing health (after a delay, if you auto-attacked them) It also had nothing to do with vision, it lacked this anti-ward passive. It also had movement speed, and no cooldown reduction. Also, because the damage was delayed, you could counter it with Zhonya, and use heal/shields before the passive killed you.

The second was like the one we have now, except that the passive did true damage. However, it also had a significantly lower base damage, although it had a 200% lethality scaling. Therefore, it would only do good damage in dedicated lethality builds. It also had no cooldown reduction, and its movement speed was only out of combat.

The third, which is the current version, is a slighty modified version of the second incarnation of Duskblade. It has a significantly higher base damage, but no scaling. It also does physical damage. However, the base damage far surpasses the amount of damage that you could potentially get with old Duskblade. Also, the fact that it does physical damage doesn't matter when the target doesn't have a lot of armor to begin with. It also has cooldown reduction and no movement speed, compared to before.

People started complaining about Duskblade when this third version was introduced. This third version also proved to be a massive balance headache, forcing many champions to be balanced around the fact that it exists (see: Kha'Zix, Wukong). It was even worse before the damage nerfs, as even assassins without invisibility like Zed, and even non-assassins like Graves, had to receive compensation buffs because they were nerfed due to Duskblade.

Therefore, I must ask: Why doesn't Riot revert Duskblade to its old version? Its old versions may not have been perfect balance examples, but they have been much less of an issue than current Duskblade.