There is no false dilemma here.
The solutions that you keep forcing of "include the videos into patches" or "stream the videos off the internet"
is the false dilemma, since multiple times by multiple posters it has been pointed out that GT5 did not do either thing with any of the videos there.
You also don't have to pay anyone to change your HDD, you can do it yourself.
I imagine if everyone could simply do it themselves, many of the warnings and answers in the FAQ for doing so that are blatant common sense statements would not need to be there. This is the same game system where Best Buy set up and advertised a service to upgrade the PS3 firmware; so no, this sort of thing doesn't come so naturally to some people.
When I buy a PC I know at some point I will upgrade some components of it.
It's nice to know that you're not the kind of person who isn't technically minded, but your high skill level is not particularly insightful for this discussion about the people who truly are not. For a franchise with a much wider demographic than is the norm for videogames, you are absolutely going to run into the "What key is 'any key'" people more than you would with a game about simulating the joys of working in the command prompt in Linux.
If PD released a 100GB update I would just change my HDD if I wanted to continue playing the game and get the update.
My heart would go out to the people living in, say, Australia.
As far as your "research" goes, guess you missed the first Google Search result:
http://www.gran-turismo.com/sg/gt6/manual/#!/save_load/autosave
Um... so... I suppose that's supposed to help someone who doesn't fully understand computers, but I certainly can't see how. If anything, "at least 10 GB" is going to confuse them more, since even people who regularly work with computers get tripped up by the difference between installed space and usable space.
Stop crying and solve your problem, you have many options.
I think it's cute that you think I'm arguing for my own experiences and skill level; what with the over 40GB on the SSD that I installed in my CECHA PS3, that I also field stripped down to the bare motherboard to replace the thermal paste, upgraded the fan to the original 19-blade design, and replaced the Blu Ray drive by swapping the daughterboard when it broke; rather than just arguing for the people who don't know how to do those things and shouldn't be expected to when it is beyond their capability over something that shouldn't be compulsory in the first place.
This all makes me wonder what you would say to the people who'd have issue with these sorts of updates for the even bigger elephant in the room that is bandwidth caps. "Buy a better internet package"?