This I am confused about. What benefits, other than not seeing the PSU (which you can easily hide behind the console), does this have over an external one? It keeps one of the hottest components out of the console, and if the PSU dies, you don't have to send in the console to get it fixed.
Why does there have to be a benefit when the context was one of asthetics, you opened with "Toaster" so I chose the ugly external power brick, simples.

In a living room t's usually less convenient to have an extra brick to hide among the other cabling, if it is a strong heat source then a tangle of cables around it isn't good and if an internal PSU is well desogned then it doesn't lead to an excessive amount of retained heat.
Good point on the advantage of replaceability, I have heard of a few XBox PSU's going south so I agree it's less to send, not had a PSU problem myself but I have a spare PS3 if I need it.
Back to topic (ish) on other comments:-
The game is as playable on PS3 now as the other platforms - Certainly is since Bethesda gave the other platforms a bunch of bugs to level the playing field, nice.

It's not a coding limitation, it's a hardware.
Over time (Which is something that's hard to test) the game becomes clogged up with information, Testers weren't probably aiming at having a one playthrough of over so many hours in one save.
LOLWUT!

So dev's ignored the information on how long players invested in characters from Morrowind and Oblivion, not thinking many players would rack up 100's of hours in a character? Come on.
Unoptimised code ported onto a system that isn't tailored to specifically use a platforms resources efficiently will always struggle, unless Bethesda can or is allowed to do that then any DLC added to PS3 will have issues as it's supported by a rickety vanilla base with added "Fixes".
For the next game rather than hiding a poor example of a game until release and then trying to play catch-up as lies and half truth's come to light. Bethesda should drop the PS3/4 unless it will do a proper job or outsource the port to those who can.