Two of the applications that Gridsync currently depends on and bundles -- namely Tahoe-LAFS-with-ZKAPAuthorizer and Magic-Folder -- are in the process of being ported to Python 3. Because Gridsync is already python3-only -- and because building and shipping two separate python2-only binary packages alongside Gridsync has been and continues to be an enormous burden -- Gridsync should switch to building and shipping python3-based Tahoe-LAFS and Magic-Folder binaries as soon as it it feasible to do so.
As an added bonus, once this process has been completed, it should be possible to build PyInstaller "multipackage bundles", significantly reducing the overall size of the Gridsync application bundle.