He still struggled like crazy to complete probably the most basic fire style jutsu despite being the prodigy of his gen and Indra's transmigrant.
The rest of my post has everything to do with the topic of this thread.
He came from this:
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To this within a few days as an 8 year old:
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The size of his fireball rivaled the size of his father's, who has years of experience and chakra on his side:
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Reminder, this is an 8 year old Sasuke.
Also, Sasuke may be the prodigy I'd his generation, but that does not take away the fact that Itachi was stated to be a prodigy in general, not just of his own generation. He was even hailed by the Third Hokage and the First Hokage, yet you want to compare him to Sasuke who received no such praise by such upstanding figures. To say Sasuke struggled with fireball Jutsu simply because he wasn't on Itachi's level on the first try is just a new level of hate.