What they mean by "change the damage calculations of tanks"?

[dank1]

if people leave the tank job with the same mechanic,tank stance/dance, and same skills right now only for dealt a less dps then they are not truly tanks.

People tank for different reasons but nerfing tank dps (if that happens) is completely unnecessary nor was it requested? I'd hope it wasn't something the general forum community has been asking for.
And how are you going to say real tanks don't care about a dps loss? I consider myself plenty a real tank having tanked all content in game, but you want to know why I tank? Because being a good dps only increases the speed of your run so much, being a tank with good dps on the other hand has much more noticeable effects on the speed on a run . That is why I chose to tank and I do it well, am I lesser tank because of it though? Lol

To be fair, can't please everyone.

Can't please everyone but why are they doing this? Who was complaining about having to meld optional materia, sure lots of people were doing it but it wasnt REQUIRED and still isn't if anything it was a bonus not a burden. The only people crying about anything related to how tank dmg works were those who did not want to contribute to dps due to not wanting to step out of their comfort zone and just wanting to stack full vit and spam their aggro rotation because its easy