Cafodd y rheolau a’r gweithdrefnau ar gyfer amrywiol dribiwnlysoedd datganoledig Cymru eu datblygu mewn modd tameidiog, o ystod eang o wahanol ddarnau o ddeddfwriaeth, gan olygu eu bod yn gymhleth ac yn anghyson. Datblygwyd llawer o’r ddeddfwriaeth honno y tu allan i’r broses ddatganoli. O ganlyniad, ceir bylchau ac anghysondebau nad ydynt yn addas ar gyfer system dribiwnlysoedd fodern i Gymru. Dyma’r sefyllfa hyd heddiw er gwaethaf rhai o’r newidiadau a wnaed gan Ddeddf Cymru 2017, gan gynnwys creu rôl Llywydd Tribiwnlysoedd Cymru.
The rules and procedures for the various devolved Welsh tribunals have developed piecemeal from a wide range of different pieces of legislation, making them complicated and inconsistent.  Much of the legislation was developed outside of the devolution process, which has resulted in gaps and inconsistencies which are not fit for a modern tribunal system for Wales, and this remains the case despite some changes made by the Wales Act 2017, which created the role of the President of Welsh Tribunals.