While those devices are far from perfect they are an evolutionary step in how people are able to interact with technology.

My mother in law does not use a computer or smartphone at all, but she loves to use the Echo because it provides a familiar interface (speech) to services she would use (music, weather, casual information search).

And interacting with voice assistants is a two way street in my opinion. They will get better at understanding what we want and we will adapt to phrase our questions in a way the software understands.

And while I doubt us folks would use a voice assistant to query a solution for an error message on stackoverflow it still provides a convenient way to control music, lights, shutters while our hands are occupied in other ways (cooking, drawing, crafting, ...)