I became curious if this development situation will be improved further.
Who would you expect to improve that?
Various contributors.
The communication on this mailing list (for example) will provide helpful information.
Are you thinking of the developers of the official W3 recommendations
Some items are waiting on corresponding clarifications. https://github.com/w3c/qtspecs/issues
or the developers of BaseX?
They hopefully continue to share remarkable insights.
Would you like to improve error reporting any more?
How will the available software evolve further also according to information like “BaseX offers a complete implementation of the XQuery Update Facility (XQUF).”?
Version 1 is fully supported. We might add additional features of Version 3, depending on requirements of our users and clients.
Thanks for this information.
Regards, Markus