Why don't people like to pick/use Tenacity over Determination?

[DRKoftheAzure]

@Reinhardt_Azureheim there is no info on the Tank Mastery Trait that tanks have since that is automatic 20% damage reduction, so the math is probably a bit skewed there at least for mitigation...

[Reinhardt_Azureheim]

@Reinhardt_Azureheim there is no info on the Tank Mastery Trait that tanks have since that is automatic 20% damage reduction, so the math is probably a bit skewed there at least for mitigation...

The tank mastery trait that got introduced into Shadowbringers merely presents a baseline / fixated amount of mitigation and is supposed to fill the gap that the former tank stances left. Mitigation strength got adjusted accross the board (like Dark Mind and PLD Block only being 20% instead of 30%) to accomodate this passive trait for pre-SHB content (particularly Stormblood Ultimates). The only time you take Tank Mastery's mitigation into account is if you compare a tank to a non-tank, but not when comparing damage taken between tanks.

Furthermore to nail down the effect of this trait:
- Stormblood and prior: remaining mitigation got adjusted to accomodate a permanent -20% mitigation compared to devs expecting us to use DPS stance and giving us stronger % mitigation in return.
- Shadowbringers and beyond: damage calculations for tankbusters already take into account you having this trait, so effectively it is like us being in DPS stance in HW and SB, no difference.

TL;DR: We dont calculate Tank Mastery into basic calculation. Instead, the damage without additional mitigation is being presented as the new 100% instead.