In any case there are other areas of regulation, such as environmental protection. What will happen when those are relaxed?
It has many advantages compared to a system where the government to literally pre-define every single thing in the economy and create specific regulation and test procedures for it, even if in most cases these things are not needed.
Acting like the world of judicial regulation (which takes years and lots of money to see through) was somehow better seems like rose-colored glasses. Whether the FDA’s scope should be adjusted is a different discussion.
Food quality was improving before FDA was established and continued rising after as well. Most quality improvement is driven by consumer demand that was the case before and after FDA.
Your mention of “quality improvement” is another slight of hand as that’s not really the FDA’s purpose nor do you support it with sources. Show some data for food (and drug) safety preceding and following the FDA and we can discuss.