Personally, I'm not a fan of key-bindings of the form <modifier sequence>-<some symbol that requires a shift key>. That said, what I find intriguing about including the Transient package in Emacs is the potential for supporting menu-driven Transient interfaces to existing commands in a way that doesn't break their default behavior. Such future Transient menus could be shipped as a default and obviate the need to learn complex key bindings.