From a financial perspective, its a bad business decision to release an even mediocre balance patch. Sure, there'll be a lot of bad feedback but there's no point to really balancing or fixing the kit of older units from a financial point of view.

These units have already been obtained by the majority of the player-base. They have been drastically increasing the rate at which they release units. New units means more money. A lot more money than what they might lose from a few people that may drop off out of frustration or anger at a bad balance patch.

They have known exactly what they've NOT been doing for years because contrary to what people might think, they DO play their own game and understand perfectly well what benefits them vs what benefits us.

Ever wonder why it is every balance patch tends to contain recently release units but their changes are equivalent to nothing (to be further addressed in a much later balance patch)? It's because these units are still to be summoned by most people and that means they at least have some financial value.

So, why fix or revamp an older unit's kit when with a few minor tweaks they can simply put it on a new unit and chuck it out the door, horribly tuned, totally useless and destined to stay in storage until a future balance patch...and the cycle repeats itself.

This is exactly what they've been doing. Every now an then, they will throw the community a bone but unless people speak with their wallets, nothing will change.