Minato doesn't stand a chance against Tsukuyomi, without knowledge about the level of Itachis Genjutsu, so that there isn't a way of canceling it, he will fail. Furthermore, Itachi has plenty ways of catching his opponents in a Genjutsu, whether with his Dojutsu, other parts of his body or even crows he can equip with the Sharingan, in order to catch the opponent off guards. Crows always proved to be able to create openings as they block your sight and distract you, what was always an advantage, whether if used by Itachi or by Aoba. The small things sometimes make the decisive difference. Further you underestimate Itachis various skills, your view is to one sided and you doesn't even look at what Itachi could achieve. Not only that Minato will simultaneously carry the risk to be caught in one of Itachis strong illusion without even noticing it and above being solo'd with a single eye contact, Itachi on the other hand will be fully protected by his Susanoo - already the ribcage should be enough to render all of Minatos attacks useless. Also, like any other Shinobi, Minato can be fooled by an excellent usage of Bunshins and feints, Itachi makes successful use of; and someone like Minato, who hasn't effective attacks based on mid or long range, but have to hit the victim directly, will have no choice apart from attacking Itachi directly, latter in return making the use of explosive Bunshins to land a dramatical hit on Minato.