Sometimes most traders think maximizing lots of strategies will results in quick actions but it differs, yes a profitable market depends on a good strategy in as much as you can be consistent in it. And clearly sticking to a particular strategy doesn't seem profitable in the long run as things tends to change this is more reason one get to hold on to different strategies while working with one.
Indeed, because working in the market by becoming a trader must have many ways to be able to avoid losses and can have more opportunities to be profitable. Because as you said that one strategy alone is clearly not enough for every trader because the existing strategy is sometimes not suitable for the long term or less suitable when there are conditions that make the market change. So traders do have to have more ways so that at certain moments we can use the right strategy in order to gain profit in a short time.
That is the fact, you can't just hold one trading strategy, you need to try many strategies and see which one will be more better for you to be using to get profit. But when you keep on using one planning and losing you will never get the benefit but when you used one and you see it not helpful is for you to change it and used another one. Normally I see many people that don't like using other strategy but I didn't blame them because they are getting profits on it and they don't want to used another one and see if he will work as the other once. We should always make difference strategy to trade because the market is unpredictable if you try things and you lose you can try another alternative and probably you can get what you are looking for. If you have used one strategy and he works you can continue using it, but I can probably says you are not a deep risk-taker in trading because professional traders used different stages to trade to achieve there goals.