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.)