Unfortunately, there is no real, separate translation for "maessig" (sorry I can't easily type the German letters!). if you look at many translations of words that end in -maessig, it just gives the feel of making the previous word possible, so to speak...? So here, it would mean that it promotes the purpose/cause.?
To me, that would mean making it more likely to achieve your purpose, so more likely practical/convenient. The "judicial" has a very positive aspect thatis absolutely NOT part of this word. In fact, they say "altho possibly immoral, etc"
