FLTK is just very spartan compared to e.g. Qt; from my point of view it is only useful for very simple GUIs; I hardly have any applications anymore that do not need item views or rich text.
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If you want a halfway house, there's the FOX Toolkit. http://fox-toolkit.org/
It's not so active these days, admittedly.
Well, there is also Tcl/Tk and some others, but they are all at most half as powerful as Qt. An interesting alternative could be Flutter; however, you have to write (at least) the GUI in Dart, which is not everyone's cup of tea.
TCL is interpreted, so presumably it's not as lightweight as FLTK and FOX. I don't imagine Flutter is nearly as lightweight either.
Tk is just a shared library accessible by any compiled language; there are many C/C++ cross-platform applications using it; it was actually also the first GUI toolkit used by Python; it's true that it includes Tcl which is a scripting language, but that doesn't matter much. It's nearly as lightweight as FLTK and Fox toolkit.
Applications AOT compiled with the Flutter SKD are surprisingly lean (i.e. compared to Node/Electron) and not much larger than Qt applications.