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"Your observations are really valuable. Consistency and focus on strategy is vital to a trader's success. It's very common for new traders to get confused by multiple strategies, so it's wise to stick with a specific strategy that will work over time. Thanks for sharing your thoughts!
Not always the same strategy will give you the same return in trading, while you may need to make some adjustments to increase your chances of getting profit. In some circumstances, your main trading strategy may still not produce anything and that is why you need to make some adjustments to combine it with other strategies.
The right strategy approach allows traders to get returns, but some other things also need to be considered including the right moment and time in trading. Analysis is also needed regardless of any strategy, so profits do not only depend on the strategy.
Using a single strategy may be a good option but it can never be guaranteed reliable in the future. This is the reason why we have to keep informed and updated with the latest market trend so that we can adjust and level up our own strategy if it's no longer working anymore.
Also, if you have variety of strategy that you have proven valuable in your trades, then much better. That way, you will no longer struggle in trading because you come to trade in the market with reserved strategies that are proven worthy and useful.
I share your view and I have used one strategy to trade the market before, it was a trend trading strategy. One thing I can't decipher about the use of one strategy to trade which I don't think people are considering is how the one strategy helps you spot your trade, know the overbought and oversold region and also help you decisively know the exit time and levels. There are different strategies for all that, people overestimate the the power of one strategy, professional traders need more.