It has been this way since GT3. A handy beginners tool, or when you’re racing on a new track you’re unfamiliar with. I like having it there just in case, helps me keep my cool in case I begin to push a little too hard. I almost never use the suggested gear though. And the MT - should say Manual Transmission yeah, I bet it says AT for those Autolazies out there.
In the closed beta there was a way of turning it off but I haven’t checked in the final version.