I think that request pretty straight forward, and many users will support that request/suggestion.
From my side I can say that Web version working better than I thought, but have many technical limitations that do not suitable with my proffesional methods/approaches of work. Starting from inability to open files by their extension and saving only to Download... working offline... GitHub... privacy policies... up to policies of the company I'm working in.
You can download a beta of a desktop build of C3 here: https://www.scirra.com/forum/construct-3-desktop-build-beta-currently-win64-only_t199344
We'll be continuing to refine this and improve the distribution of it in future.