I love these kind of debates, because when you get down to it, it's downright silly, because what matters in this equation is the use of the computer. If you are surfing the net, watching movies, checking email, then the iMac is certainly good enough to do all that and all of the fancy processors, GPUs, externals and other toys are totally unnecessary for that. I have 8 year old Mac Pro 3,1 for doing some photoshop, video conversion, music editing and it does what I need it to do. A new iMac would do all that as well, as would a Hackintosh, but what would I want to spend the money? Remember that a computer is just a tool and you too can be a tool.
You are right. After all, an uninformed public who buys into the hype is quite willing to over spend on a computer thinking they do everything they want and that the Apple echo system is above reproach. If someone only needs to surf the web or perhaps do a little writing or similar, the iMac is not only well suited to the task but is over kill. These are the same people that could get a system that is less than half the price to do the same thing.
As for anyone with just a bit of computer knowledge to understand the basic components of a computer might also get swept into the over priced iMac line up. I say over priced given that some of the technology that comes to the public is already behind many counterparts in the PC world ranging from CPU to GPU. As for thunderbolt, it sat on many a system and never touched because it was an expensive means to an end that USB3 handled just fine. In short, you seem to praise the ignorance of the masses and find those that demand a bit more from Apple to be suspect.
Candidly, I find many of these conversations/threads to be a bit specious but at times there are excellent posts from passionate uses of Macs that bring up some very good points. As for me, there is very little left in the Mac line up that meets my needs but I am sure they might meet yours. It appears that the population of Mac users is varied and enjoy exchanging their thoughts and experiences from totally happy to frustrated. We all as well get to sure the magnificent
"Apple Tax" for purchasing their hardware much akin to some film cameras of yore. Yep, we can be proud we are all members of "the club."