I think DG has given a really interesting twist to the whole discussion & shown exactly how there can be exceptions to every rule. That it comes down to ebay sometimes needing to make a sensible decision on a case by case basis.

Overall, I would say that the whole process has to be as simple as possible though. Making buyers jump through hoops before leaving feedback probably isn't going to be a great idea. It could annoy them more, if anything.

I know a lot of sellers feel upset when feedback is not about the transaction itself but about things outside the seller's control eg item didn't fit, they didn't like it as much as they thought they would, 3mm was narrower than they thought, Aust post was slow etc  but while  feedback  remains in its present form (ie individual comment, not just tick the box options), you will always get some of this. It's the nature of the beast.