Question: "What's the point of knowing different methods when we're going to follow only one?"
Answer: Its always good to know that the method you're applying is in fact the better one among all the rest. for that you should know what methods have been developed,their pros and cons and why you're not using those instead, who knows you might find some other method more useful for your project? This way you can create your work with maximum efficiency. knowing the current work done allows us to explore future possibilities as well.