Let's say you want to cut away one or two minutes from the middle of a movie file. Try it with QT 7 and then with the new QT. See the difference in usability? For me the difference is enormous, and I blame Apple for that.i've always depended on QT7, but... what's missing for you? you can edit, record, loop... think i'll survive without it (either way, QT7 alone is not enough to have kept me from moving to 10.15).
QT7 is enough to keep me from moving. But I also have another 32 bit app I simply cannot live without. It's called DragThing and the developer announced it will not be upgraded to 64 (I don't blame Apple for that).
Then the Catalina's apps replacing iTunes do not allow for drag and drop (manual) transfer of media files to my 4 iOS devices. Since I do not sync, but always transfer manually, Catalina and possibly future MacOS versions would be of no interest me. Mojave with iTunes 12.6.5.3 is more than good enough.
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