^This.
Say you are a crafter with lv50 craft level, will you be getting more or less quantity/quality master writs with all the new motifs coming out?
Are you getting more because the factor was *(number of motif learned)? (You will have higher chance than before if you go collect the new motifs)
Or are you getting less because the factor was *(number of motif you learned/number of all motifs)? (You will have way less chance to get master writ than before until you start collecting new motifs)
And does the drop rate change every patch?