Dialogue has its place, in certain films. Those films would be what they are without it. But even in those films, there are usually parts that are without dialogue and those parts would arguably be worse were they filled with dialogue instead.

Many of the most emotional and powerful parts of great movies are shown, not told. Also, I'd argue that it's usually worse and more shallow movies where every little bit is explained and spelled out for the viewer (often in dialogue or narrative exposition), and very little is left if anything is left for them to figure out, make sense of, or decide on their own.