The unofficial point tracker is cheating. Whether or not it is possible to stop, does not change that. Obviously in online dominion, as in many things in life, cheating will happen no matter what anyone tries to do about it.
Someone brought up liking the point counter because it stops them from ending the game when they are behind. This is exactly the reason I HATE the point counter. Knowing when to end the game used to be something that separated a good player from a not so good player, but anyone can see "Hm, I'm down 7. Buying a 6 point province will still cause me to lose. I'll buy a duchy!" To me a good player should AT LEAST be able to know who has bought what victory cards in a 2 player game. The piles all start with 8... know what you buy and do subtraction. For the unofficial point counter, knowing other splits is HUGE and having something tells goes against the nature of the game. Having something tell you "You lost the GM split 6-4 and the Peddler split 7-3 BUT you have a small lead" is huge over thinking "Was it 5-5? Did I win 6-4?"
Secondly, with the logic of "if it's illegal people will still do it" etc. So what? If people want to cheat by writing down all the cards on paper, oh well. If they feel they need to get ahead by cheating good for them, I hope it helps them when they aren't able to do that. But the point is they are cheating.
I don't like the official point counter, but I don't mind playing with it or without it. Think of offline dominion where all you see is the board (where you aren't even sure of exactly how many cards are always left in each pile) and your deck/ discard with an unknown # of cards. Online already has given HUGE advantages to people that can't keep track of things on their own, why should even more be available?
With all that said, I don't consider everyone using it to be "cheaters" looking to get an advantage. I liken it to the Jeopardy! online qualifying tests. There is NOTHING to stop you from quickly google searching all the right answers and passing the qualifying test. Does that mean it's not cheating? Obviously not, as (I hope) we can all agree. However at the next level you would be exposed, when you clearly DON'T know much. Similarly here: There is NOTHING to stop you from quickly seeing the deck contents and using that to pass the "qualifying test"...
I think we all agree that we LIKE dominion. And probably a majority started out playing IRL. So in general things should be as close to that as possible. In a perfect world for me the only info given outside of what each player plays/ buys would be the # of VP chips accumulated. But, it is what it is.