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In the book The Hidden Persuaders (1957) by Vance Packard he describes research into failing pre-made products that revealed the buyers (homemakers) felt less self-worth if they weren't required to undertake at least some of the preparation. (IIRC cake mixture was the case study.)

There was also a similar response by pharmacists when drugs first appeared on the market requiring no preparation.

I find the taste of the hand mixed one to be an improvement on the premade bottled one. Although my preference for the taste may be nostalgic as that is what my parents and grandparents did as well.

Oh, that bottle looks exactly like those shaker bottles people use for protein shakes. We had one of those bottles too, but it was red.