He also told you not to leave your smart phone in your room? (which has higher odds of being hacked than a Control4 panel) Or to turn it off so the microphone doesn't pick up any conversions? How about your Alexa in the bedroom? You really think it's not listening? Even worse, that Alexa thing with a camera in it.
Again, T3s and T4s are not surveillance cameras, they are intercom devices. Your installer told you to use wireless cameras instead of Touch Panels? Run away from that installer, he's not very good at what he does. Two completely different devices for two completely different purposes.