The ONLY ACTUAL problems are the unhealthy levels of SALT, SUGAR, and FAT.
Unfortunately the "solution" often given for too much sugar, is to replace it with artificial substitutes. This introduces a new problem - things that we haven't traditionally consumed which have unknown long term effects not just on people's bodies but in some cases on the environment too when these things enter the water system.
The key point in your statement is "unhealthy levels", salt sugar and fat are fine in moderation, in fact our bodies require some level of each of these in order to function at all. Replacing them with unnatural substitutes just makes things worse, reducing excessive consumption is the answer.
However reducing consumption is fundamentally incompatible with a for-profit food delivery model. No food producer wants you to eat less, so they introduce all these artificial additives so they can claim there's less (salt|fat|sugar) and that therefore you can now eat even more.