Damage Tahm still isn't great for carrying. Grasp and tank can still destroy lane with nearly the same damage except it's safer, and stacking tank stats rather than HoB also gives him damage, so idk why you wouldn't.
He started building more AS and instead of getting more resistances/hp/damage, he got frozen mallet for utility. Frozen mallet is good, but titanic hydra for auto-reset basically negates the need for hail of blades, does more damage, and allows you to clear waves quick with the sacrifice of like 400 hp (grasp gives hp so it might even out the worth with overgrowth too).
Don't look at my match history though I'm only mastery 7, 2000 games into LoL and still can't win against a Singed lane as a melee champion (except Nocturne top, even at that I still spellshield a tick of his gas instead of his E and it annoys me to no end). Also, my CS is low on winning games, often I am too distracted by giving people the tongue rather than minions.