Quicktime Reference is of course not a codec unto itself. It references other media in whatever codec it was created. If Media Encoder can import Avid DNxHD and ProRes, why was is deemed a good idea to kill support for Quicktime Reference to media in those formats? "Please encode using a professional codec" doesn't apply, the media is already using a professional codec. The reason to avoid encoding a new file is obvious. It takes time, processor cycles and storage space that shouldn't be required. "Use Media Encoder 2017"? Doesn't that negate the supposed purpose of killing support for legacy codecs? Ya know staying current and taking advantage of new features?
Adobe please explain. Better yet, just restore QT Reference support.
Not a peep from Adobe, eh?
a) that is community support forum so that mean that you can get here help from other people that using that piece of software. That does not mean that from time to time someone from Adobe shows up and help but you can't expect that there always someone from Adobe here and will give you answer on all of your and anyones questions.
b) I would not count on Adobe bringing back QT ref or any other killed of QT legacy formats/codecs
It's Apple who wants to promote their Metal Graphics acceleration and this only works with 64 bit applications.
So, eventually they will remove support for al 32 bit codecs or applications in near future. Apple informed developers that macOS Mojave is the last version of macOS to run 32-bit apps.