Mate, you are so wrong here, but I completely accept that your belief here is not unique.
Firstly, there's a lot wrong with using processed foods, but I'll skip over that.
If processed food is now "traditional" then that's a bit sad. Really.
Secondly, made from scratch tastes way better than box mix. Because, you know, flavors. Now I get that tastes, especially nostalgic tastes, are very subjective so YMMV. But processed foods are always made to fit a broad market, so are typically bland. Cake mixes typically use sugar as "flavor", so "tastes good" to someone raised on an American diet will tend to lean on high-fat, high-sugar.
Outside the US the emphasis is more on flavor than sugar. A coffee cake has a strong coffee taste. A chocolate cake uses real chocolate and so on. Using better ingredients makes for a better result.
Getting consistenty in baking is really not hard. Yes, it takes a bit of practice. But it's a skill a child can learn. My son was baking by himself at 6 years old. It really isn't hard. And it really does turn out better. And ultimately it has better food value as well.
Yes, I agree, that US culture is different. The days of grandma teaching kids to bake, of parents teaching kids to bake or cook is dwindling. It's sad to see this learned helplessness in the kitchen, which then leads to dependence on "big food" to decide what you eat. Fortunately they prioritize your health, not their profit.
Personally I'm grateful that my elders taught me to cook, and something I taught to my kids. If you are able to, I recommend it as a skill with passing on.
Calling it "snobby" suggests that it is a skill you have not yet acquired. And indeed a skill you feel you cannot acquire. You are incorrect. It is easy to do, you really can learn how, and the results are far superior.