People think it will be a shift of some or all of the damage from str to vit because of the context clues in the interviews. References to penta melds being better than vit raid accs, mentions of enmity, ability to release crafted accs of relevant ilvl instead of super behind because of penta balance etc. Also because that would be the simplest solution. Damage based on vit fixes all the weird hoops tanks jump through for gear that no one else does (millions on melded gear no other job does. Vit gear being trash fodder. Tanks expected to gather str gear they can't need on to be 'good'. Heals don't need to fight for int gear, why the unfairness?) .

If vit gear is always best for tanks then they become like every other job. Simple 1 dimensional gearing. Parity is reached and all they have to do is tweak the outgoing raid damage in future raids to match new hp levels and add a smidge of hp to account for tanks doin max damage all the time.

It's the simplest solution to a smorgasbord of issues surrounding tanks. The idea that it will be some convoluted adjustment to defense is so much more effort to manage as SE. Just make current vit better than str so tanks have the same simple optimal hearing as everyone else and it fixes everything.