We do though. The translations are a bit weird but it's not that complicated.
Mahoraga's adaption doesn't just stop adapting, it continues to adapt, it finds new ways to adapt. The first way it adapted was by altering it's CE properties to counteract the properties of limitless. Altering the fundamental nature of your CE is not something Sukuna can do. So he was looking for a "blueprint" as he puts it, from Mahoraga on how to attack/bypass infinity.
And that second adaptation, ends up being actually targeting the space that encompasses Gojo. Not just sending a projectile at him. Essentially almost like a sure-hit from a Domain Expansion.
And we see that here
The wheel turns, representing an advancement in the adaptation. He then uses a slashing attack, and Yuji even directly compares it to Sukuna's.
The dialogue "Show me what you got" is actually not the best translation. It's actually a callback to what Sukuna told Megumi back in the Finger Bearer Arc.
More along the lines of "Enchant Me"
And in Shibuya, when Sukuna recalls that, he thinks "You showed me the way Fushiguro"
So here Mahoraga is literally showing him the blueprint for how to attack infinity.
We know Sukuna is a glutton, he is a consumer, and he has mastery on a divine level of Jujutsu. Remember, we were told that after seeing the soul being split once, he was able to replicate it essentially on command. A similar sentiment with restoring his burnt-out Cursed Technique with RCT
So what he did to defeat Gojo, was replicate Mahoraga's blueprint (attacking the actual space of gojo, not just sending projectiles that will never hit him)
It's a bit similar to the prison realm thing with Gojo. Gojo had the technical skill to shrink his domain that small, but he needed to actually experience being in that realm in order to pull it off
Jujutsu is all about the your imagination, the mental limits you place on yourself, how far you are able to interpret with your cursed technique etc.
Again, it's a call back to Sukuna's domain, described as "A masterpiece painting on air, without a canvas"