One of the key qualities of Pro Tools was always its solid professionalism with regards to past sessions. Where you'd need three+ plus different versions of, say, Logic to open an older session in a current version, Pro Tools would just give you a couple of pop-up options, make a WAV copy of the SD2 files and you'd be back in business.
Unfortunately this wonderful feature ended with PT 10/11. I have a large archive of PT sessions that is really hard to access at this moment - Pro Tools 2018 doesn't recognize batch copied wav versions of former SD2 files as being the same files, even with the same name, and even using PT10 on a different computer just to update the SD2 files isn't an easy option, because you can't install PT 10 on current MacOS versions without fiddling with the installer. BRING BACK THE GOODS!