This is a little bit of a skewed view on how balance works with ships in the game. No one at WG intentionally designs ships that are overpowered and must be balanced later, it costs us time and resources to do so. As many others have mentioned, we are doing overall balance to all CVs, not just premium. These changes are necessary to nudge this entire class in the direction the team believes it needs to go to achieve better balance.
We of course would love everyone's feedback on PT if they are up for it!