If you were on my software project, and you weren't using native controls on macOS or Windows, one of the big two on Linux, or Electron, you'd better have a damn good reason.
GUIs don't need to be heavyweight to be accessible or internationalized (excepting for text translations, which should be downloaded rather than installed)
I don't know much about GUIs but lightweight tools often fail to take accessibility into account, and hand-rolled tools almost always do.
> The LCL should automatically provide accessibility for all of its standard controls, or allow the underlying widgetset to provide its own accessibility for the controls utilized directly from the widgetset.
Video games count as a damn good reason.
The point of the comment asking about Qt is most likely that Qt is not heavyweight (it does a great job even on embedded.), therefore pointing out that there is a difference between Qt and the other you mentioned.
I'm not a fan of OOP and I think there are more interesting framework model - but Qt is definitely the best and most efficient GUI framework I've had the pleasure to work with.
Not only slow GUIs but GUIs that demand tens or hundreds of MBs just to draw a few items