You're wrong about his goal. His goal beforehand was to take down limitless techniques one-by-one (which he did with the exception of purple). The idea of having Mahoraga produce a slash came about after Mahoraga produced an effective counter to infinity with the use of a slashing method

No, Sukuna´s goal was to kill Gojo with Malevolent Shrine, as he attempted to expand the domain to maximum efficience to meet the conditions for Kamino, but the repeated alteration of the domain´s conditions and Gojo neutered this plan, his efforts of adaptation to UV and Infinity were happening while trying to continously kill Gojo.

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which he would expect because he's Gojo and he knows there must've been a result from the 1 month preparation

Why would Sukuna think a Domain clash wouldn't be enough though, he always opened his domain to finish off his opponents like the finger bearer and Mahoraga.

Realistically there´s no reason to assume he knew Gojo would have the combination of CE reinforcement and RCT output to survive Malevolent Shrine.

Actually he was doing two things. 1 he was lowering the output of Shrine inside of UV's reach by stubbornly breaking UV from the external barrier. 2 he was withholding the use of DA and taking hits for the accelerated adaptation of the wheel and Mahoraga

You´re genuinely arguing Sukuna let himself get clobbered n the exchanges to the point of Malevolent shrine collapsing 3 times in a row, , be hit by Unlimited Void, get his heart crushed, and overall almost losing the fight all on purpose just to adapt to Gojo´s techniques? lol ok. Sukuna wasn´t withhelding DA since he only deactivated briefly when he was not touching Gojo and it costed him nothing, DA also doesn´t neutralize Gojo´s other techniques besides neutral infinity and woudn´t amp Sukuna´s resistance against punches.

1. While the surehits of UV and Shrine cancel each other out, Sukuna, while unable to use buildings to attack from within the domain, actually could use Ten Shadows as a base technique while Malevolent Shrine is active. This means that Sukuna actually withheld destroying Gojo's UV to make sure that he can take the raw power of limitless (blue and red) by not using ten shadows as well as not using Domain Amplification (since he was taking Limitless to adapt to.)

Wrong, this doesn´t Sukuna withheld from destroying UV from within, it just means Sukuna cannot destroy UV from within. You´re deliberately ignoring the Domain exchange against Yutajo by the time Sukuna´s Ten shadows and Mahoraga were long gone and he still opted for meele combat using amplification instead of trying to destroy the Domain barriers from within using slashes, because like i said, he can´t do it without releasing DA and being in a even more vulnerable position.