However, are you planning to visit your parents in London, Canada this weekend? Then an assistant who would still answer with the time of London, UK would maybe also not be the smartest?
So really context is everything and making broad statements that if an assistant was to answer with anything but London, UK should get fired is something that someone would say, who IMHO should get fired. shrug
Also, IMHO, if someone doesn't know that machines don't have human context and therefore doesn't know to ask their digital assistant "What is the time in London, UK" when they want to know the time in London, UK, then maybe they should get fired from their tech job. shrug