It is no surprise for those who have been testing the ClassicPress Alpha and BETA releases of ClassicPress that ClassicPress would announce the BETA version is ready for live sites.
On their blog today, December 06, 2018, ClassicPress made that announcement.
With the release of WordPress 5.0 there have been inquiries into whether or not ClassicPress can be used on Production sites.
Take a look at what ClassicPress has to say here.
If you are looking for a viable alternative to WordPress/Gutenberg, ClassicPress seems to be willing and able to put themselves in that position.
Before you take the plunge, you should know that ClassicPress has been working for a few months to get ready but they do not have a full release yet. Reminder, “Beta” software is, by definition, not production ready software.
According to ClassicPress – It does what WordPress 4.9.8 does. Maybe even a little better. Classic!