Bit harsh to call the grading system flawed. 15 of the 16 teams who are in the 2018 SFC 1 would have been in Pot A (round one winners last year) this year under the old system. The odd team out are St O. Plunketts ER who were beaten in Round 1 last year.
The Div 1 finalist you mention would have made Pot A in 2018 but had a few disappointing years before that which counts against them. The Div 3 team bookended a couple of bad years with good years, they would have been in Pot A In 2018 too.
The grading system was approved by a massive majority of representatives of the clubs. DCB is not some group of people hidden in a dark room in Parnell Park, it is a County Committee who make decisions democratically with every club having an entitlement to take part in decisions. If a method used is nonsense it is nonsense because nobody put forward a better method that would work . Maybe if the Hurlers came off the ditch…?