ITR is mainly good when you have a healer on your team, as then you can take the armor talent instead.
And even against heavy sustain enemies, taking them quickly to 35% hp gives them a low enough healthpool to be at risk.
Most of the uses i currently see for MA are to aid him in QM. But not in draft. But for QM tychus is already lacking at many aspects. So a MA buff there isnt going to harm, while in draft MA is generaly the bad talent to take (or you took tychus at a bad moment).
Titan grenade. 5% of max hp, and 250 damage at level 0 values.
Zuljin has 1800hp at level 1. That is enough to deal 15% of his max hp as damage. This gives a lot of finishing potential.
And tychus without the damage bonus does still quite some damage. Its not like his damage suddenly goes below 1% of someone’s max hp. His damage against zuljin is generaly about 5%dps hp anyway (obviously a lower percentage against high health targets).
Tychus can also chase the target with overkill (which does about 25% of zuljins max hp over 4 seconds), which makes finishing a target easier than you expect.
The last 35% arent as hard as you might expect. And forcing them to hearth is often still a win situation. And keeping the enemy healer busy means the healer cannot heal other targets.
Not killing the target does not mean it is bad damage. If you negate the effectiveness of 1 player, you already traded perfectly fine. And if you negate 2 (by keeping the healer busy aswel) its a win.
Thats why TBTA is dangerous, and why the treshold reduction from 40% to 35% was a quite significant buff. It made the killing potential a lot larger.