On April 3, the New York Times reported
Apple has hired Google’s chief of search and artificial intelligence, John Giannandrea, a major coup in its bid to catch up to the artificial intelligence technology of its rivals.
Many technology focused blogs picked up this news and started claiming it as proof that Apple is now taking AI seriously and working on improving Siri to the level of Google Assistant and Amazon Alexa. I don't doubt that Apple is working to improve Siri. In fact, I would be shocked if they were not working to improve Siri.
I have a hard time believing that one man, one executive is proof that Apple is taking A.I. more seriously than before. Mr. Giannadrea will be in charge of a team of employees and reporting to Cook so, it is not likely that he will be the one writing the code that will make Siri understand questions better. He will, most likely, not be the one updating database code to handle more queries more quickly. He will be laying down the bigger, future forward road map of the internal process of updating Siri.
I am not saying that is not an important part of improving Siri but, the idea that Mr. Giannandrea will single-handedly improve Siri is a bit of a stretch.