Suit yourself. If this is a deal breaker for you then by all means cancel your order. Im just saying id rather err on the side of safety. This device has more than enough power and battery optimizations to offset antivirus background processes.
These antivirus software now can tell you if the site you are accessing is compromised. It wont prevent you from latching onto a compromised access point but it can warn you before you make the mistake of entering your credentials into these sites.