You would be surprised. As long as "demand" is analyzed in the hypothetical, your results will be skewed drastically.

There was a grocery or meal shipment start-up based in London that had all analyzed demand by studying their potential user-base, yet their product never took off. Their result: a lot of people said they would buy, but never did.

The market itself gives you the results you're asking for: Manufacturers are definitely studying and trying everything feasible, since this is such a saturated market.

What sells is where people's priorities are.