What makes a stat "interesting"

[Claire_Pendragon]

An example of "changing" would be, Press 2, instead of 1 for the same effect.
An example of "improving" would be, +1 to attack power. (If attack power helps you perform your role in a group)

So an example of both, is "All attacks hit twice" equating +100% dmg. (If your role needs to do dmg)

An example of changing, but not improving would be "Auto attacks do x2 dmg, but you now auto attack at half the speed".

It's not exciting to me, unless the change equates an improvement to the performance of the role I'm assigned to excel at.

But just slapping on "changes", which also improve my performance, every month, from a new weapon/armor bonus, might go against "class identity". (Which may or may not be important, depending on a few factors)
Along with effecting if I enjoy the play style/mechanics of a class.

Lets say I really enjoy a Tank class, but each month, the new weapon effects change the play style I fell in love with.
Or the Tank class I dislike, finally becomes likable, because of a change in gear.... then comes the next update, and I no longer have that play style. Making the class a waste of my time to have maxed out.

I'd rather have this customization left to "Talent trees" like in most MMOs, rather than gear. (Or something like materia, where I can re apply it to my next gear)

For clarification, I care about "play style/mechanics" solely based on how it helps me function at the role.

I hate classes with too many DoTs, and any class that has a lot of DoTs, I do marginally worse at, than those that don't.
So gear that gives me DoT abilities to use, might raise my dmg when performed right, but will make me personally make more mistakes, trying to juggle that extra work.
An example of "performance" under a more grey situation.