I always build Kraken first, but recently I started thinking: why don't we rush Bork like the other on hit champs tend to do?

Especially with the Warmogs and health tank meta, I feel like it would just be stronger, no? After 1k HP you're doing 60/auto at full health, which translates to better passive damage on than Kraken which is about like what 50/atuo? And as the game continues, you end up with even stronger DPS against even squishies, but especially health tanks. At 2k HP you're doing 120-60 damage down to half health, which is WAY more than Kraken's passive damage on average. And against health tanks with like 4k HP it just gets better and better. Not to mention it just has better natural synergy with your passive, since it's an execute: having more upfront damage from Bork is just better, no?

If someone has an answer please explain.