Other than that, it works to some degree of high probability to predict a short-term target, probably usually just by chance, but I'm sure there is some validity to the techniques.
Why did I reach this conclusion? Well, for one, I've never seen two people with matching counts. It's just too subjective.
Anyway, that's my take.
It takes time to study and apply Elliott successfully. Some people give up in the process and make claims that the method does not work. It will not work if you don't put in the required effort to thoroughly understand it. Now, like all methods of analysis, an Elliott wave prediction is probabilistic meaning you are not 'guaranteed' of the outcome. But we believe it is the best there is.
The comment about "best predictor of market moves", however, I must question.
I, personally, like to look for simplicity in the systems of trade/ predicted market movements that I develop for my own use and, over the years, have came up with some very simple one's, using a couple of MA channels, the use of fibs extension tools, and a single price indicator, making trades on that system with over 66% success rates on those trades (for going on 100+ trades on 4 hour time frame) and P/L ratios of 2.0 and better. I've had better than 75% success rate on a simple "guppy MA" set-up that waits for an engulfing candle (for over 200 trades on 15 min time frame) with P/L ratios of 1.5 or better.
My feeling is that the market is constantly changing, so no one system will always remain the best at predicting future market behavior. Thus, I spend most of my time "calibrating" to the market based off of patterns that I can see playing out more recently on the various time frames and also calibrating my systems to get the best success rate and P/L ratio set-ups for specific trade vehicles (my system for trading SPY is different than that which I use to trade BTCUSD, for example).