i have never needed QuickTime to import videos.
nor was it needed for Video Thumbnails.
I did a clean install on Win7, 8, and 10.
This is why my title is so clear.
All Visual C++ payloads were successfully installed.
The only problem is importing Videos, and Video Thumbnails when viewing items in folders.
This leads to Lightroom.exe hanging because DynamicLink fails to initialize.
I can promise you.. this is a bug.