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"is insightful" is correct and usable in written English.
You can use it in contexts to describe a person or idea as having wisdom or insight that is beneficial or helpful. For example, "His analysis of the problem is insightful, and has proven to be very helpful."
Dictionary
is insightful
adjective
Possessing insight.
Exact(60)
His Beethoven is insightful and strong.
His commentary is insightful at times.
The result is insightful and funny.
"And because he is insightful, he's influential".
His writing is insightful, humorous, and mostly easy to follow.
James Bennet's article on Al Gore (Jan . 23 is insightful.
"You want your jokes to have a point of view about something that is insightful.
But Mr Bernstein has yet again produced a book that is insightful and thought-provoking.
The Face and the Brand Asymco.com | Pretty much anything Horace Dediu writes is insightful.
Revealing the humanity with which he treats his cases, Shepherd's memoir is insightful, candid and compassionate.
Lieven's book is insightful – and depressing – about a hugely important country.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com