Broken? So when Joey Ka say:
I don't believe a truly balanced tactical landscape is ever possible
That means for you that the game will be always broken? No the game is not broken, there will ever be a better way to exploit it and so I don't understand why the managers who has exploited the game in the best way would be penalized and become, in one change, the big losers. And that would be the case if you increase the cost of OD and IS.
I don't say that the last changes are enough, in fact I don't know. But I prefer seeing small corrections here in there, which give times to the managers to make some adaptations.
If the changes are best for the game, the changes need to be made. The best managers will adapt as always and find ways to thrive in the new environment, and those who have followed in their footsteps to achieve success will struggle until they find the new footsteps.
Your design philosophy that anything that's overpowered cannot be fixed because it inconveniences those who took advantage of that power is a noble intention, I'm sure, but it'd be a horrible decisionmaking process from a game design point of view.