It sounds pretty symptomatic of the mindset behind this film--messing with stuff that didn't need to be messed with, and going back to show things that, I would argue, didn't need to be revisited. The explanation in TWOK is great as it is; was anyone really clamoring to see the incident on film when we already knew the relevant bits?
Now I know how you old-timers felt before TPM came out.
(I was 13, so I was just excited for new SW on the big screen!
But what's worse, it seems like they couldn't discipline themselves to sticking entirely to the established material, and they didn't have the guts for a full "reimagining" or reboot--so they went for this split-the-difference crap that is just going to cause continuity headaches down the road. (Maybe I'm being too pessimistic.)