Likely it is not Adobe, but QuiRcktime that makes life difficult. That is where they got their name from.
Works fine for me, so maybe the trouble you're experiencing is machine related, not Adobe related.
1st step for anything Quicktime related is to RE-INSTALL the latest version of Quicktime (i.e. un-install current, install latest).
Simultaneous question: what type of Quicktime encoding are you using? 264 or something else?
Try that and let us know how you got on.
I would add that exporting to QT works for me also... but I do use QT Pro and I do not allow it to do auto updates (ever).
I choose when to update it.
I find QT a valuable and reliable workflow within my own workflows that offers me the flexibility to operate in a multi platform creative environment of my associates and clients....despite what other say.