I don't understand what you mean by a few people get to define it. This stuff is used by basically every desktop environment on Linux. You have to either use it or write something very similar to it if you want to have permission prompts that actually work. They all give the option to turn it off but they still have to support it for the average user you described. Unsurprisingly, the requirements for shipping a desktop are really not that different on Linux compared to other operating systems. The users all want the same things.
From what I have seen, the amount of users that want to go back to the Windows 95 style of security are an even fewer people. You can find distros that still ship a desktop from that era but they don't seem to be for much beyond novelty.
From what I have seen, the amount of users that want to go back to the Windows 95 style of security are an even fewer people. You can find distros that still ship a desktop from that era but they don't seem to be for much beyond novelty.