Thank you again, lingobingo, for the time and mental effort you are putting into this. I really appreciate it.
I think what you're suggesting about abstract notions seems to make quite a lot of sense -- we may be on the right track here
π Smile :). For instance, the example sentence you provided in #8, starting "Although the distribution is worldwide...", seems to work because "it" (apparently this refers to uveitis)
is distributed across the width of the world -- this is not the most natural way to put it, but I think you know what I mean.
Nonetheless, I still have my doubts that the two examples you provided are highly idiomatic/common. But this is something only a native speaker of English (and a knowledgeable one like you) can throw light on.