Well, Dominik, yes, it *is* more stable, though perhaps no more 'real' than --not 'the author's recension' --the paper posted to a non-stable URL without DOI that could as easily disappear tomorrow. As long as we still have printed books (which thank heaven I guess will stay around at least during my lifetime, however much of that is left), the presumption is that a reader interested in tracking the reference should be able to see exactly what the citer saw. With ephemeral web materials that is simply not true -- as you of course know very very well, so I presume that you might have been 'trolling' a bit to start a discussion? ;)
jonathan