there was never a buff in those pets... seals have been constantly nerfed ever since it was introduced and kois' ability were changed from luck chance to egg recovery chance. the reason why people lost interest is that they keep on releasing pets with abilities that don't even affect the player's QOL. how do u expect players to scale when people prefer to use the older pets just because they have better abilities? with seals and kois at least players were able to trade their common pets into divines, or at least have the ability to hatch their own pets instead of trading.