In general I think you are right. There are some problems that arise however. For instance, which theatrical release is the right one? There were a number of them for Seven Samurai for instance, because audiences in some countries found it too long. For me, I don't know better, so I spring for the longest one possible! Might as well soak in as much Kurasawa goodness as possible! And with Blade Runner, I would agree had I seen it back in the day, but it passed me by so I've only seen the version WITHOUT the narration. I've also only seen the REDUX version of Apocalypse Now, which has several missing scenes put back in. Again, I don't know any better.
Someone is going to pipe up about Star Wars very soon too no doubt, because there are stacks of versions, most of them crap and apparently the only 'true to theatrical release' you can see, even now, is the laserdisc version. I have the boxed DVD set where Lucas finally put in the original versions as bonus disks, and that's good enough for me as being the 'original'. I actually 'YAYED' out loud when I saw the opening credits and it DIDN'T say 'Episode IV' (",)