You need a backpack to hike. You could hike without one but that would involve carrying everything in your hands. Backpacks are the evolution of ergonomic design to make carrying items on long journeys comfortable.

You need a towel if you travel. You could drip dry after each shower or decide not to at all but that introduces another set of hygenic and time-wasting problems.

You need utensils to eat. You could use your hands, again not paying attention to hygiene, or you could be civilized and use a knife and fork.

Researching and buying the best ensures you should only buy once. It's appreciating that someone, or group of people, have spent months, even years paying attention to every detail in designing something that serves an important purpose.