My biggest problem with what OP says is about PC. There are plenty of other things that I'm too lazy to disagree with, but I'll stick to PC.
You said that there are only 5 direct PC cards in the game, and that's true, but its also true that antimatter and reverse time aren't direct CC. Consider that bypassing shields or weapons serves the same purpose as destroying them.
When people in Kong chat bring up how Aether is OP because of dime shield, the response is always: pack PC. This doesn't just mean deflag, steal, SoFo, and Pulvy. It also includes things like spell damage (read: unstable gas or psions), momentum, quanta denial, and stalling until duration wears out. Other types of shields require different workarounds. Reflect and jade shield beat psions, but you can always lobotomize them. Adrenaline beats Procrastination and Permafrost, although its vulnerable to other shields like fire and thorn. An answer to a shield isn't always one of the 5 direct PC.
Weapons are a bit trickier. The only direct, non-destroy way is to freeze a voodoo doll, which is insanely specific and bad for the same reasons butterfly effect is bad. But shields and heal permanents are still ways to neutralize weapons, or answer them. Unupped Arsenic's poison is completely stopped by several upgraded shields, and Titanium shield unupped. Of course, most weapons shine with skills, not damage. Quanta denial and immortality still stop them dead in their tracks. All this considered, is there still an easy way for all elements to stop weapons? No, but that's why weapons are some of the most powerful cards in the game. That's why they're rare.
Non-weapon/shield permanents are still untouchable except by the 5 direct PC, but that's not always a bad thing. Permanents are powerful, and the uniqueness of PC among
,
, and
gives them an advantage that is simply one of the things that makes each element unique. Adding PC in other elements would dilute their effectiveness, and I don't think Elements really needs more PC cards. Permanents and PC aren't unbalanced as they stand.
Also, from that same standpoint, its incorrect to say that moar shields = moar profit??? Permanents are great because of the relative lack of PC, so you only need one or two copies of shields of weapons for most decks. In
, the extra 4 slots that could go to other cards are now taken up by Dime Shields. Why? Because they last 3 turns, as opposed to 5 for Wings and forever for every other shield. Aether only has a shield for 18 turns max, as opposed to infinity turns for any other element, barring the answer of PC. Their strength is that they are immune to physical damage for 18 turns. Their weakness is that they lose card and quanta advantage by having them in the deck, and once the 18 turns are over, they can easily be outrushed. Another strength is that if destroyed, they can just play another of their dime shields. Another weakness is that the shield would be gone in 3 turns anyway. Moar shields ≠ moar profit.