The guy complains about it almost weekly on his podcast when discussing anything AI related so I’m sure his not making it up.
They are often trying to be ‘too clever’ for their own good and try to interpret what you have said and assume they didn’t catch everything rather than actually looking at what they did capture first. They also often ignore what is locally stored on the device.
Windows search/cortana is an absolute nightmare for this. It will go to bing before even bothering to look what’s actually on your local computer. Completely useless.
I pretty much just ignore Siri, nice tech demo when it came out however many years ago but I’ve yet to find anything useful for any of them. You can almost always do what you need to do faster by just putting out your phone.
Edit: I should add that a car is probably the best use case to date as getting out your home isn’t an option but a lot of that could be mitigated by giving us a few more buttons.