That's because processed or instant food taste are stronger. After eating, baby might not like the normal food that we prepare at home due to no taste or less tasty. Personally I tasted Cerelac. I find it too sweet. I fully understand the time consuming part. You can try to cook at times and offer cereal when you are really busy/tired. Cooking wise-just steam or boil everything together!
I am not sure. This is first time i heard about it.