Before launching the final versions of the different OS presented in the last WWDC Apple has in hand the rest of the previous beta versions and these also need various adjustments. The versions of macOS, iOS, tvOS and watchOS that we have right now will be updated and these will stay forever on some devices so they have to be fine in terms of their functionality.
La 12.4th beta of iOS 5.3, 10.14.6th beta of watchOS XNUMX and XNUMXth beta of macOS Mojave XNUMX They were released yesterday, but Apple has in the immediate future the release of the final versions of iOS 13, watchOS 6, macOS Catalina 10.15 and tvOS 13.
In these beta versions of yesterday stability, security is improved and ultimately few improvements are added beyond this. In Cupertino they have to leave the version totally stable, without bugs. Obviously they can update the previous versions once the new ones presented at WWDC are released, but what is intended is not having to play one more time everything is in final versions.
These new versions for developers are already available so as always if you have a developer account you can download it. If you are not a developer, the advice is to stay put, since in the case of watchOS, the version also remains installed without options to go back, so any failure or problem would be a headache. In the case of watchOS you already know that there are no public betas, so in this sense it is best to wait for the final versions when Apple releases them.