maybe some other uses of timestamp could be considered besides putting the time ad date on a picture
for instants : a name , a place , a holiday, whatever you want ...
it could also be interesting to have a choice of exif information ingraved for the situtations you dont' have a pc around but you still can view the picture
the text could be very small somewhere at the edge of the picture (rawversion) or large enough to be conserved during processing into jpg - author's choice
maybe i am just dreaming .....