Mediocre popularity for a supposed main heroine, that's why.
Why wasting money on a character that no one care about?
That’s why Sakura vs Shin was one of the most popular fights in the Boruto series to date
she wasn’t even even the heroine at the time...
That’s why Sakura vs Shin was one of the most popular fights in the Boruto series to date and she wasn’t even even the heroine at the time...
Because it doesn't sell.
You know what DOES sell though? Sasuke! Hence Sasuke Shiden.
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You know what also sells? Itachi... Hence Itachi Shinden.
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And so on and so fourth.
They tried with Sakura and made RTN and had some episodes with her family but after that they didn't try.