Tropes/archetypes are a tool that lets you reduce exposition. Whenever you invoke a n archetype, you bring in between a paragraph and a page worth of description, which you can add more details to by describing how the situation or character diverges from the trope.
Tropes and archetypes are useful because they reflect reality in some way. They're actually how we see the world. When information is scarce or coming in too fast to process, our brains do a fast-approximation and fit the people and places around us into iconography drawn from our past experience. If you've seen one bearded, bald-headed biker dude, your brain makes a fuzzy image of that, and then fits all the other biker dudes you meet into that iconography. This iconography is overwritten as more data comes in, and that biker dude becomes Dave Jorgenson, the Weekend Warrior with strong opinions on barbecue sauce, but the iconography remains in your head. The tropes and archetypes become tools in the toolbox your brain uses to understand the world.
The amazing thing about fiction is that it allows us to gain understanding of new archetypes without experiencing them directly. We live the lives of fictional characters, and because those characters and the stories they inhabit reflect reality, we gain an understanding of the real world.
This might sound outlandish because fiction itself can be pretty outlandish, but fiction reflects reality, and you know it reflects reality because it gets popular when it resonates people and it gets iterated upon as people take the tropes out of the original story and use them to tell entirely new stories. That only happens when a trope contains an element of truth to it.
Lets take an extreme example: The mad scientist. For decades, popular culture was obsessed with the mad scientist. From when Mary Shelley penned the adventures of Doctor Frankenstein and HG Wells wrote about Dr. Moreau to the schlocky B-movies of the 1950s, the mad scientist was all the rage. And while there were no scientists turning corpses into jigsaw puzzles, the universities were filled with scientists and academics who insisted that God was dead and it was time to make the Modern Man, and scientists were dreaming of superweapons that previous generations had never dreamed possible, and more academics dreaming up new ideas and new inventions that would forever change the world.
I wonder if the Mad Scientist trope declined in popularity because we reached the point where we could no longer remember the world that was, and smart scientists with big ideas became passe.
Anyhow, fiction becomes trope-ey for two reasons. The first is when the author doesn't fill in the details. A mad scientist is just a mad scientist with a laboratory, and there's no detail to make him different and no effort to integrate him into the setting. Lacking that detail, he's just a plot device, not a human being. The other reason is when a trope gets so debased, it doesn't feel real anymore. It reflects some wishful reality that doesn't fit human experience. You see this more in woke or utopian fiction, where the author isn't concerned with telling a story so much as pushing an ideology.