I understand what you are talking about. It depends what you mean by “believe” in this case. Let's say I believe that this is an expert, I believe that his opinion is based not on guesswork but on specific numbers and results, I understand that he carefully analyzes games and has extensive experience in this matter. But I DO NOT BELIEVE that all the information and all the forecasts he gives will be 100% correct. It is simply impossible to absolutely correctly predict the outcome of a match; one right/wrong move by a player can always change the outcome of the match. When an expert gives his forecast or simply expresses his opinion regarding the result, this is one thing, but when he says that he will be absolutely right and the match will end exactly as he said, then you should not listen to such an expert. A professional will never give you guarantees or promise anything.
You can listen to different experts, but you have to make a decision yourself, just as we bear responsibility for our actions.
In gambling, in my opinion, the winning factor can be obtained by the luck we have, if we don't have a portion of luck then we won't be able to win, even if we follow the words and directions of a professional in gambling, we can't guarantee we will win. It's true what you say, one wrong move can change the flow of the game, and I think this applies to all types of gambling, even gambling that requires skill to do. Moreover, in my opinion, it is unlikely that someone who is a professional at gambling will win consistently based on predictions that are always correct.
For example, if they gamble ten times a day and in those ten gambling games they can win at whatever gambling they do, in my opinion this is not because of their skill in predicting but also luck. So even if they can predict accurately but the luck side still applies, that doesn't mean that they are experts at predicting the luck side so it doesn't apply. I'm sure no one can win consistently in gambling, if they did, maybe they wouldn't make money outside of gambling. but the reality is that it is impossible to depend on gambling in terms of profits.