And definitely not because anything with "AI" in the name is now virtually guaranteed to attract far more investment and government support than things without "AI" in the name. Bing was very clear about that.
Why do we need smartphones? Blackberry works fine already
Why do we need 100Mb/s internet? 10Mb/s works fine already
Why do we need 24 inch monitors? 19 inch works fine already
Why do we need 3.2GHz laptops? 2.4GHz works fine already
Why do we need better headphones? Stock wired earbuds work fine already
I could go on forever :)
It is great fun to realize that back in the day, when you ended up properly pissed in the pub, the pub owner could simply haul you on top of your horse, which would know the way home and deliver you there.
Now with cars we may even need radar on top of video to get similar results. And I doubt you are allowed to be drunk while your car is helping you home.
...but there's a difference. Op isn't saying "why AI?"
- why do we need supercars, cars are just fine? - why do we need megaphones, phones are just fine?
To me its as if we had said "Why do we need anything faster than a 386 in the 1980s?".