If I like it, I buy it. If it needs tweaking, I ask for help. Declaring that I, personally, am a loser, a retard or in some way not intelligent enough to use the device you prefer based upon Market Share or quarterly numbers is puerile.
The connection you are missing is that the popular products get (by FAR) the most community support. Therefore if someone is looking to buy a mobile product that is a dead end because it is not getting the support needed from the designers/company/carrier then it is relevant to inform that person of the trap they might be getting into.
In fact, I think discussions of financial reports and market-share is even MORE important on this forum then say the GPU forum because computers are almost completely moldable. If I get a Dell tower or a HP laptop, I can easily (by myself) install a fresh Windows or install some new part to fix an issue because computers are an open platform.
Mobile devices are layers of locks and traps, and without the work of a few bright stars in each community almost every device in the category would be limited. The number of bright stars in a community seems to be determined by all these high level questions because quite honestly supergeeks use these same criteria before THEY buy into a phone/platform.
I can't Jailbreak an iPhone from scratch, or root an Android phone from scratch. Most can't. And if you happen to pick a device that doesn't have a community that supports these functions due to the fact that hackers won't waste money on titanics, then you are screwed. So talking about which devices are popular and which companies will be there with full resources in the long haul (for non-hacker types) is very important.
One final thing: thanks to the system in the U.S. we are locked into phones for two years. That means every major phone purchase is not just a "what is hot now" decision, but a long term commitment with the company and carrier that you are hitched to. Therefore discussion about the longterm plans and outlooks of companies and carriers is in the best interest of all involved.