I think that is absolutely dead-on. If you're not a celiac, there is no point in going gluten-free if you're not going to commit to a significant lifestyle change. Replacing brownies with gluten-free brownies is a waste of time and won't show any measurable health benefits. And generally, because wheat flour is a staple and fortified as mentioned, switching to corn starch and rice flour, the typical go-to gluten-free fours, is going to be even less nutritious. In short, going "gluten-free" COULD be even less healthy.
This isn't written in the context of avoiding processed foods. It's simply stating switching wheat flour for other junk flours for a non-celiac is just a waste of time, potentially even less nutritious and surely more expensive since you're paying for that g* logo. I agree 100%.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.