I was with you until I read your example: Replacing a something that is almost pure energy to your body with something that is pure energy won't probably make a big change on how healthy your diet is. If you are giving yourself insulin spikes between meals eating candy, your body will not thank you.
Completely agree: recently I wanted some peppermints, and I noticed the sugar had been replaced by "glucose syrup".
I didn't buy them, and I've done this for other products.
Are companies losing sales, which will make them "degrade their product" more as their revenues decline, which will lose sales, and so-on?