For sure, Qt is great even for CLI applications (if the dependency is not an issue).
All the niceties that Qt as a framework provides (file system, multi-threading [mutexes, threads, semaphores, etc], JSON, shared memory, CLI arg parsing, even a State Machine!!) are a huge productivity boost.
Qt is awesome but one of its main problems is its insistence of duplicating standard components and coming up with subpar alternatives which are then forced upon developers.
30 years in the making, still waiting for that thing to actually exist.
How long have you been developing in C++? The standard is so little, there might as well not be one. I don't even think the printf() function takes the same arguments on all platform.
My point of view is that, where I'm using Qt anyway, I might as well use its threading library for the very nice support it provides for other things such as signal-slot connections across threads.