Nah. ‘Dumb’ doesn’t really describe anything to the user reading your post, and ‘fundamentally useless’ is definitely subjective and quite inaccurate based off my usage. (Which is rather extensive.)
I use Siri every day for dictation with my iPhone, AirPods, iPads and even Apple Maps, notes, CarPlay, ect. Even though it’s not perfect, I wouldn’t be without it. It’s been a huge convenience to make my tasks more efficient and quicker.
There’s a lot of advancement opportunity for more machine learning with Siri moving forward, but with deciphering & dictation, it has made many strides.