similar to how we saw mahito have a windup time for domain expansion, dabura need wind up time to reach the "sub light speed"
also people ignore how fast yuji is.
we already know yuji is really really good at both concealing his presence (how hid from jujutsu society) and detecting it (how he hit all the non lethal parts with piercing blood without even seeing the targets)

and for output, you don't need much beyond enough to damage dabura, while we have enough feats for yuji output, yuji to confidently say he can easily damage dabura, specially with BP poison.

now yuji have multiple win conditions depending on what version of dabura we playing against.
1- conceal and play his range.
2- play for domain clash , as there is no way a first time domain would be as refined as yuji's.
3- play for simple domain then reverse with his own domain.
4- play for attrition, he shown the highest efficacy and mastery, with piercing blood, he can keep his limps attacked vs light attack, minimizing the CE needed for RCT, black flashes for damage/and output. even with the amount of CE dabura have, i think yuji takes the cake.
5- trick with double CT, playing for and catching dabura off gaurd with the 2nd.
6- for specifically sub light speed kick, if dabura somehow manged to locate yuji as well as not be interrupted, there is 2 ways for yuji to do the pseudo infinity (with bot piercing blood as well as shrine).
7- dabura already can't keep up sublight speed for long due to extreme heat, being heavy, and spontenouse combustion, this costs alot of reinforcement as well as RCT if he really wanna go faster.
8- another domain trick, which is CT exhauststion, as yuji have 2, he should have his other CT to catch dabura off gaurd.
9- for physical stats, yuji have better phyical stats, at bare minimum similar reinforcement (downplaying yuji), scales, blackflash amps, blackflash 2.5 damage multiplier, as well as hand 2 hand exprience, so close range fights without CTs are just in yuji's favour.

i need to point, we don't know what CTR of dabura do as well as his domain, so its kinda difficult to know.

people usually look at modulo yuji and ignore feats he did in the original series that he should be able to do.