I have not touched a Mac in a decade.
But a geek site reports that Mac is going to be less friendly toward un-signed apps:
"... The right-click/control-click option for easily opening unsigned apps is no longer available. Users who want to open unsigned software will now need to go the long way around to do it: first, ... ... ..."
The essay also says why this matters less for BIG developers, and is critical for "hobby" software like PSUD.
Paul Reid