The r-pi is both a computer, and a component.
Even if you had BGA rework possibilities, repair would be costlier than replacement.
There is such a thing as economics...
That is one thing I dislkike about it... You are talking to the person
who bought a Myford lathe to repair a cheap photocopier :-)
(tongue-in-cheek, but only just :-)).
More seriosuly, I do wonder how long Rpis will be available for. I
dislike designing round a 'component' and then finding it's unavaialble
when I actually wanty to make more of my designs.
-tony