Absolutely, yes! Everyone should have their own personal trading strategy because a strategy that is working for you might be harmful to the other person.
Sure, everyone may have own trading strategy because everyone has a different style and goal in trading. Some people trade daily, they want faster profits. While others may not trade daily and don't hurry to take profits. So, their goals and style are not the same, they need a different strategy.
By the way, it is true that a certain strategy may work effectively with us. But it may not work effectively to other people. However, I don't think there is a strategy that can harm people as long as the people know well their goal.
It's also not easy to find a strategy that really suits us because it's necessary to try,
it takes time and an exact process to find a suitable strategy,
like that indeed what we think can work effectively is not necessarily the same thing will happen to other people.
Yes, that's exactly right, not because the strategy works for someone means that you can use it and have that same outcome,
it's better to try to see if there're adjustments that you need to work out.
Or, it's also possible that maybe the strategy is not fit for your personality most of the time. People think that they can have
a working strategy by following what others are doing.
Not knowing the risk, they ended up losing a lot before they realize what's they've done wrong.