There is a point to reimport them.
I use LR as a DAM
and if a client wants me to send him the exact same copy of the image,
I cannot rely entirely on LR to do that (see what's happening with point curves).
That's why I want to keep the original files (same process version/identity plate).
I play safe...
Besides, this was just an example of the necessity of knowing the file profile.
I still have no answer to my question.
LR displays extensively all Exif/Iptc/etc data, but not the ICC profile !!!
PS : J.R. Ellis - thanks for the ExifMeta suggestion.