GPG, as OpenSSL, are too huge and complex in order to use them on daily basis.

OpenBSD has signifiy, which works fine. But I wouldn't mind something like a cleaned up age(1) but without the mentioned issues.

GNU tends to stack features like crazy. It had sense over the limited Unix tools in the 90's, but nowadays 'ls -F', oksh with completion and the like make them decent enough while respecting your freedom and not being overfeatured.

LibreSSL did the same over OpenSSL.