Shallow depth of field is a meme perpetrated by the photo industry so they can sell expensive lenses. There are literally dozens of ways to isolate subjects.

It's the laziest thing in the world to just buy an expensive lens and blow everything out of focus that's not the subject. It can be done tastefully if the out of focus bits are thoughtfully composed as well, but genererally most people think it's just a wildcard and the background becomes "invisible" if they just bokeh the shit out of it.

Save money, learn composition. FUCK