I had a huge advantage when I started 50 years ago - my job was secure. I didn't have to promote myself. These days there's far more pressure to make a mark so the temptation is to make adventure television or personality shows. I hope the more didactic approach won't be lost.
Food is not just what we put in our mouths to fill up it is culture and identity. Reason plays some role in our decisions about food but it's rarely driving the car.