that's exactly right, and that's why i'm torn about double grip.
goedendag is another strange beast i have no idea what to make of. as a rule of thumb i try to copy things that feel strong when enemy humans do it, but this weapon never felt strong at the hands of enemies. the way i view the goedendag is like most things in the game, i start by making a possibly false assumption - that the game is balanced, and then i try to work out how the thing is balanced, on the assumption that the game is balanced.
for example, in a balanced (and challenging) game you are required to use all weapon abilities. if you just use one, then the weapon should feel weak, because you're misusing it.
example1 - whips feel strong even when all you're using is the disarm, this violates my assumption, therefore whips are (presumably) overpowered. if whips required you to make use of the bleed as well in order to feel strong, then they would be balanced.
example2 - 1h swords feel weak, it must be because i'm not making use of the parry ability - so the weapon is (presumably) balanced, and i'm just misusing it.
i view the goedendag in that same way, it's a weapon that feels too weak when all you're using is the thrust attack, so if i assume that the weapon is not underpowered, then you need to make use of the stun in order to get enough value out of it to make it feel strong. and this is possibly true, but without mastery (due to being an early game weapon) and having only one stun attempt per turn, this weapon really feels awkward to use. it's also a shame that there's only one goedendag instead of an entire weapon type with tier 3 or named versions, so we don't get to experiment with the weapon too much. when have you found it most worth using?