Nevertheless, given that areas like welfare and taxation are not wholly devolved, Welsh Government still had to navigate complicated governance routes to make the pilot a reality.
Serch hynny, o ystyried nad yw meysydd fel lles a threthiant wedi'u datganoli'n llwyr, roedd angen i Lywodraeth Cymru lywio llwybrau llywodraethu cymhleth o hyd i wireddu'r cynllun peilot.