In other words, Alex is saying that Chris brought up an important point - a legitimate concern.
A parent may have a legitimate concern about their son or daughter's eating habits - if they are eating healthy food.Alex says that he's glad that Chris asked his question.
The phrase “I'm glad you asked that question” is used to thank someone for asking a question and to show appreciation or gratitude for someone's participation.If someone asks a very interesting question that creates a lot of discussion or makes you think about something you hadn't considered before, you should say, “I'm glad you asked that question.”
Alex then says that Hannah may be right about the importance of listening to the customers, meaning she might be correct.Then Alex says that the topic is outside the scope of his expertise.
To say something is “outside the scope (scope) of one's expertise” is used to show that one doesn't know very much about the topic, or that the topic is not related to your education or experience.“That's outside my scope of expertise.”
“Expertise” (expertise) is knowledge of something.Someone who knows a lot about a topic is called an “expert” (expert).
By saying that this topic is outside the scope of his expertise, Alex is showing people that he's going to rely on the opinions of the expert; in this case, the expert is Hannah.