Well, for Telluria the only metric for the final blow was how many players with 2700+ cups used her on raid defense.
That’s it.
They ruined a great hero because the top 5% (maybe 2%?) used her too much - a group which likely includes some of the heaviest spenders in the game. And then they immediately started releasing whole groups of even stronger heroes.
Don’t listen to this drivel about balance and careful consideration, it’s just a circle jerk to make themselves feel better about the slipshod way they release and update heroes, with obvious preference towards the most elite players. It’s just a whole lot of words repeating old excuses without a drop of real information.
Until they admit the financial considerations used in these decisions (like purchases for gem pulls, coin deals, etc), I’ll watch their actions before taking their words at face value.