I wasn't aware there were more than simple opinions but as far as "facts" go, I would always be suspicious when "facts" came from industry sources. You go ahead and believe what you want and I will do the same. It's still a free country - for a few more years anyway.
Within any niche industry, what other sources of facts would there be except the industry, its trade associations and its suppliers?
While there may be loads of "outside" information on automobile safety or drugs and medications and other "newsworthy" fields, there is no incentive for outsiders to research radio without someone to pay the cost of that research.
So what we have are audience measurements provided by an international company that does all forms of consumer and business research all over the world, Nielsen. The advertising industry uses that data, but has its watchdog, the MRC, to verify the procedures radio, TV and new media. We have research companies that do the specialized research stations use to determine formats, morning show performance and music playlists; they don't publish their findings as they are proprietary. We have trade groups that defend and promote the industry, but for the most part they don't do research... they compile data that shows radio's impact (NAB) or effectiveness (RAB).
The only somewhat broad view we have is from a few market analysts who study the publicly traded companies on behalf of the investment portfolios their company manages. But that sort of analysis is not really focused on how the sausage is made... just on how much it can be sold for when finished.
So, the only information you are going to get from radio comes from radio. Your complaint is unrealistic and disingenuous.