From my observation of some older traders who are consistently profitable in the market, I have observed that they usually are very consistent with their strategy or approach to the market.
Just as starting to trade on one pair first is important for a beginner trader, it is also necessary for a new trader to know that the easiest way to become confused is to try to learn different trading strategies from different traders or sources at once.
One trading strategy is enough to make you successful until it is no longer working.
In as much as I understand the importance of what you are trying to explain, I will still have a contrary opinion over this. I know it'll definitely confuse learners trying to learn all at the same time but maintaining just one is not ideal too. In fact, it's not even possible to learn every strategy but a trader should learn as many as he can be able to absorb. The last part of your post justifies the important of having more than one strategy. When your favorite strategy becomes obsolete, you don't need to dedicate time learning another strategy, you'll just switch to a new one.
It's going to be a lot of experiments for a trader and see which strategy works and which one is not. So maybe in the beginning, if you have built a successful trading strategy then it will be enough to consistently making money, but I don't think that it will be big enough. I mean yeah for sure maybe winning like $100 a week is already big when you are just starting.
But sooner though, you might want to diversify and make more strategies, it might be complicated for you, but if you believed that you can work with it and then be consistent, then it can probably make you more money and then you continue to evolved yourself and not just rely on what strategy to make money.
It's actually going to be complicated but it worth every time to get adapt. Single strategy in trading doesn't give a trader options in case of failure. When you have multiple strategies, you can easily diversify from one to another when strategy A seems not to work to strategy B but a single strategy will make you helpless in such situations and things like that often happens to traders.