What they say is correct. The built-in system has the capability of reading out your text messages, but allows limited (Android) or no response (iOS) options to them.
(Wired) CarPlay or AndroidAuto allows you to interact with texts properly, via the appropriate assistant.
The version installed in your car allows you to enable the first option (get notifications via bluetooth). I can speak for iPhones, you have to specifically enable the "Show Notifications" option in your bluetooth settings by pressing the letter "i" icon next to your car's name. There were many threads about it back in '17.
(Wired) CarPlay or AndroidAuto allows you to interact with texts properly, via the appropriate assistant.
The version installed in your car allows you to enable the first option (get notifications via bluetooth). I can speak for iPhones, you have to specifically enable the "Show Notifications" option in your bluetooth settings by pressing the letter "i" icon next to your car's name. There were many threads about it back in '17.