You're not really making your own bread unless you grow and harvest the ingredients yourself. What do you mean you don't mill your own grains? Refine your own sugar?Can't really even call yourself a baker unless you build your own oven. /s
Cooking and baking are basically ALL prep work and cleanup. The actual cooking and baking is overall a pretty small fraction of the overall effort that goes into making dinner or a loaf of bread. Go ahead and feel proud of yourself if you take on more of those preparatory tasks, IF it makes for a better end result. But that doesn't mean you get to act superior to somebody else on a different path of their own personal cooking journey. Drawing an arbitrary line in the sand and saying "this is cooking, but that is not" is kind of like drawing a line between blue and indigo on a rainbow. It's arbitrary and adds little to good the discussion.
Go ahead and cheat on those components where it works. Not everybody has the time, space, energy, or skill to make every bread, sauce, or spice blend from scratch. If you can make something better by getting back to the basics and fundamental ingredients, go for it! But let's be honest when it's more about pride than the final product, enjoyment of the meal.
Personally, the biggest reason I prefer to avoid pre-prepared foods that only require heating is so that I can avoid certain common ingredients that are often pumped into those things in insane proportions, particularly salt and sugar. It's not so that I can feel proud of an arbitrary label.