If that is the case what is your point? That select audience wouldn't replace on the 360 either. If someone doesn't need to update then they don't do it. Being able to user replace the drive is pro-consumer, easy for those that find out how, and in absolutely no way an unachievable task.
How a drive can be replaced is only ever going to be appliable to a consumer that needs to do it. If your mother doesn't need to/care for/or can't replace a 360 hard drive she wasn't replacing a PS3 one no matter how the process is carried out.
My point in regards to Sony not selling official hard drives is that those people that need to or want more space have clearly not had a "99.9%" percentile issue with the PS3 as it's now sold what, nearly 80 million units and Sony have not needed to release any official hard drive addons. That speaks volumes.
Your original point was that a built in non replaceable HDD was a terrible sin to humanity, but now it was suddenly something else.
If HDD crash, people turn it in for service inside or outside warranty, and hardly anyone, at leas with a 500GB drive won't replace the drive. So this affects less than a fraction of a percentile of the users. Ad due to the external HDD support, they're not effected either.
Or they just unscrew the one screw holding the HDD tray in instead of spending silly money getting it "repaired".
They said in the presentation you could use USB3 HDDs but not what size. Current Xbox is limited to 32GB for NO reason whatsoever.
Really, you know so much about the internal workings of the 360 you can flat out state it is for no reason...