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No strategy works perfect. The same strategy that made a person win jackpot fails with the other person causing heavy loss. As mentioned these strategies are just the trials, where the positives were put forth whereas the other sides of the dice weren't mentioned. To win, we develop and follow different process. If it brings win we'll praise, if not we just ignore. With gambling, it is much about luck than strategies.
Various strategies can be used if it makes the game more entertaining for us, but, yes, we must know that it's not a scientific method we are using, so, we shouldn't expect a positive outcome. I, for one, prefer betting with a low probability of winning, and if I lose I'm not frustrated about that, I know it was very likely to lose if the win chance was 0.1%, right? And if I win, it really gives me that great feeling of being so lucky. Mathematically, this strategy is no better than betting with 90% win chance all the time, but I just choose what suits me, what makes my gambling experience more enjoyable, that's all.