The new WP 5.4 is out, and for anyone not using Gutenberg it’s a bit of a non event.
The notes here are to me a little less that feature filled:
Most folks will not have any issues, keep Gutenberg disabled, and your theme and page builder should work just fine.
I can offer no advice on the state of Gutenberg at present, it is still in beta. But live 🙂
The field guide (https://make.wordpress.org/core/2020/03/03/wordpress-5-4-field-guide/) has some users with random issues as is the norm with recent WP updates and all things Gutenberg.