you will get the specs of an high-end kitchen sink for the desired price of a Brondi.
It would be still hypothetical, but I would expect better (from my point of view) results than the currently available models.
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.
This is why people think big companies like Apple, Microsoft, Samsung, etc. are arrogant when they say they're making products we didn't know we needed until we got them. It's not arrogance; it's that their market research is infinitely superior to a simple poll.
With a poll, we're only constrained by our imagination. Real life has more constraints. The thing the big companies do: balance their research with real life.
A good market for phones would include products aimed at lots of different bases, but unfortunately for FOSS phones we're not there yet. So my attitude is to support this phone, and hopefully move toward a world where there will be multiple FOSS phones with different feature sets.