I would strongly urge you to not go to extremes when it comes to certain component aspects.
Personally, flavor is critical. Full stop.
I’ll repeat that: flavor is critical and “non-negotiable” for the big picture.
If you fundamentally alter the taste, then I stop buying. Like Hershey’s Chocolate for instance. I stopped buying a lifelong favorite brand, and an American icon a year ago when they changed the formula (as a result of moving their processing facilities. The loss is beyond measure, but the bottom line is, the product fundamentally changed.
I understand diacetyl (from a marketing point), as there’s so many people that succumb to the “campaign” to eliminate it due to the ties to the prior factory issue (even though levels of exposure are dramatically different). Personally however, even though I don’t think a miniscule percentage is harmful over the long haul, the facts are still out.
Now A/AP on the other hand seem to be in the minimal risk category, while having major contributions to flavor. When those two are removed (as evidenced by the use of substituting Butyric Acid as their replacement) things fundamentally change, and for everyone. To some, in a very negative fashion. To others like myself, while not negative, there is no doubt that the change remains obvious. (Those who do single flavor tests, and have compared the DX/v2 versions side by side with their original, can easily and obviously pick which is which.)
TLDR: If you are thinking about removing anything other than diacetyl itself, think long and hard. OR, think about introducing a second and adjacent line, if you’re wanting to assuage the paranoid (which I was one of for a time).
Considering the fact that we’re typically dealing with sub-1% numbers, on things that have not been scientifically shown to be a risk, I’m willing to chance it. Remind yourself that even the number one selling flavor out there has diacetyl (Capella Vanilla Custard v1) and/or A/AP. We’re minimizing the risks vs cigarettes and tobacco products.
Some things you just don’t monkey around with. Got that Hershey’s??