https://screenrant.com/frasier-reboot-theory-niles-absence-feud-explain/

Kelsey Grammer offers a new update about the Frasier reboot, and it suggests a dark scenario for David Hyde Pierce's Niles in light of his absence.

Niles Isn't In The Frasier Revival - The Sad Reason May Not Be What You Think (https://www.looper.com/1422656/sad-reason-why-niles-not-in-frasier-sequel/)

David Hyde Pierce didn't join Kelsey Grammer in the "Frasier" reboot, and the in-story reason for Niles' absence may be sadder than you'd expect.

Frasier Confirmed Whether Niles Is Dead (https://www.looper.com/1434334/is-niles-dead-frasier/)

"Frasier" fans may be sad that Niles is not appearing in the Paramount+ revival. They'll likely be interested to learn more about the character's fate.