I would like that rg and release series would be ordered by
Release group series automatic ordering :
date of earliest release then catalogue number of earliest release then name
release series automatic sort :
date then catalogue number then name
it is currently just name and thus series like https://musicbrainz.org/series/3b8fac97-b01b-4c76-b11a-ea080d39ed21 are not well ordered.
they have many elements so a manual ordered series would be a pity to manage.