Uh. it's Itachi we are talking about. How much do you think that he can hold Susanoo up?
Not to mention, Naruto in KM mode made 20 clones which were able to fight kage level shinobi.
Itachi's Susanoo isn't tanking 20 Rasenshurikens, nor can it tank a senpou chou odama rasengan.
Not without Itachi collapsing at least.
Don't even get started here with the, Itachi will collapse stuff.
-1 Genjutsu
-1 Tsukuyomi
-1 Clone
-2 Fire Styles
-2 Extended uses of Amaterasu
-Susanoo for at least 5 min.
All this before
his illness killed him,
he never even ran out of chakra. And as characters are taken at the strongest point seen during the series, this is clearly an Itachi who wasn't near death like he was vs Sasuke. Using Susanoo especially when the last version isn't necessary is (V3 will be used) not a problem.
Lmao. Itachi's second weakest Susano took on
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Rasen Shuriken isn't doing anything to a his V3 Susanoo with Yata Mirror and as FRS is a Fuuton, Yata Mirror will change its properties and reflect the attack right back at Naruto. And FRS>Senpou Cho Odama Rasengan so that is tanked as well. No Rasengan is ever getting through Susanoo.
Also don't go thinking that KM Naruto can spam clones and use high level moves like FRS constantly, because there is a limit to the chakra Naruto took from Kurama which is used to enter KM. A limit he exhausted during the war when he reverted to Base after trying to make a Bijuu Rasengan against the 3rd Raikage and he wasn't even spamming high level moves like you claim he can.