What are the major flaws of voice assistant technology?

to add to the list: - inability to recognize slang. - lack of customization based on previously recorded data to offer better features. - most(not all) voice assistants have a very tech feel to them and IMHO lacks a bit of a human feel to them.

Users with certain disabilities, such as speech flaws, like not being able to say certain letters or stuttering, voice assistants may not be a effective method of interacting with devices.