Qt has nothing to do with the Apple Technology QuickTime, QT, see the difference in capitalization of it. Right now Studio is built using Qt 4, mostly because the plugin architecture changes between Qt versions as mentioned above. Qt is used by many companies, like Google, to create cross plattform applications using comming codebase. Many of the new technologies that can be used to replace OpenGL & OpenCL rely on QtKit 5, DAZ Studio is built using the cross plattform application kit called Qt, which has been around for a long time and was developed by the Norwegian company TrollTech, then was under the wings of the Finnish mobile company Nokia for some years, but then has been on it's own two feet for some years. Just that is a hell of a challenge unless you want to have muitple codebases and multiple versions of the same software, and believe me, you wont. To support macOS 11 you need to support it on both hardware plattform, while keeping support for the pre macOS 11 OS versions. Currently DS depends on technologies like Iray, OpenGL, OpenCL, that either has been removed on macOS 11 or does not work on the Mx series of chips, or both.

Read thing thread from a '3rd party Apple developer's perspecitve', having gone through the 68k -> PPC transition, the OS9 -> OSX transition, the PPC -> Intel transition and also the Intel -> M1 transition for some projects, all I can say is that you need to make this right, and doing so will take time, a lot of time.

Daz3d big sur