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I think it's less about fear of innovation and more about other constraints like space and readability.

A comma in most condensed sans serif collections like those used for nutrition labels (Helvetica, Univers, et al.) takes up less space and is more readable than a bullet or other glyph.

Here's a quick example using Roboto Condensed and the ingredients for Fruit Loops. The bullets are longer or harder to read. (Using Roboto Condensed because it's free so others can test with it and it's comparable to Helvetica/Univers).

Sample: https://i.imgur.com/HeYTdWr.png