You see to me the change to
Aragorn's character is more significant (i.e. suggesting he has refused the kingship), and so is the change to the
Breaking of the Fellowship. Aragorn is a more significant figure, and the Breaking of the Fellowship is (to me) the pivotal moment in the whole of the story (ie across all 3
books).
At one level, the key thing about the Fords scene is
Frodo has to make it to
Rivendell on the brink of death and the 9 need to be swept away. That's inviolable. In order of importance afterwards comes Frodo's defiance (shame that's lost); but the fact its
Glorfindel (and by the same token, that its not
Arwen) seems to be much less significant IMO.
I think its maybe worth recognising that all of us respond in a way that is part rational and part emotional. I'm still quite bugged by
orcs climbing pillars, and that there were so many thousands of them in
Moria... But it doesn't really matter in lots of ways! My head tells me that, but in my heart I just don't like it.