Like when games exports to html5 only, cant export to exe,etc.
NW.js export work in practice at the same thing of an .EXE file, so dont worry about it!
you can also export as web gaming, and convert html5 to lot of platform games like android and ios and much more.
after trying several tools like game maker, fusion, stencyl, I think that only C2 offers the best for what it costs