As an opinion, as in I could be right or wrong, skin weighting solutions would be last of my list of improvements that needs to be made for physically correct characters in Unreal 5.
The bottom line due to the need to correct the volume of the skin weight it’s improbable that the correct shape of a joint could be achieved with out an assist by other means.
Top of my list would to be able to add targets, like an LOD, when they are needed and not have to anticipate the need as part of a over all collection of corrective poses as the “need” is usually done via discovery as part of the iterative process.
For the most part this is where an application like Daz Studio is misunderstood as it’s not a turn key solution that gives the perfect solution but rather a solid base from which to work from as to what can be harvested based on access to the separate elements that makes up the character.
For example
“Has anyone been able to achieve good looking eyes in daz characters”
The simple answer is yes as the eyes that are added by default is an element that can be excluded and added in Unreal as a component of the character and make use of such assents already available in Unreal.