A lot of the problems associated with guberbug have to do with the fact the WP is not including or supplying any way to integrate. These issues have been documented on both the ACF github issues and the guberbug github issues.
Some of them are listed here https://github.com/WordPress/gutenberg/issues/12692
The developers are doing the best that they can with little cooperation from the other end.
It’s all well and good to dis ACF, but it’s not all their fault.
Edit: Please note that I am not an ACF dev and my opinions may not reflect the opinions of the ACF devs.
