That is where you are wrong.
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Sasuke didn't make a attack with the
addition, he made an attack using the same kind of chakra he already possess.. That's why it's so important for you to comprehend the manga.. Sasuke
COMBINED the chakra, making it one chakra, the jyuubi's chakra..
Why is Hagorom's chakra so powerful and where did it come from?? Kaguya. Who is Kaguya besides hagorom's mother? The jyuubi.
Who gave Sasuke half his chakra? Hagorom's ... Understand??
Now 15 years later Sasuke's chakra grew tremendously. Evidence is the last(meteor), the gadien(accomplished a feat only known by Kaguya that was said to use a massive amount of chakra).
Tell me what stops him from using indra's arrow? I'm under the impression open a portal takes twice as much chakra as using Indra's arrow.
FYI: for all you clowns(Indra,blowvex) that believe Kurama's chakra allow Sasuke to use humanoid Susanoo in the Boruto, it's impossible. The kyuubi is one single bijuu, Sasuke needed
all COMBINED aka jyuubi's, kaguya's and hagorom's chakra..