After David Hyde Pierce revealed his condition for reprising Niles, I won’t accept any excuse for not seeing the younger Crane brother in the Frasier reboot. Kelsey Grammer has always been great as Frasier Crane. Even when he was a side character in Cheers with minimal screentime, he shone, so despite the initial skepticism of awarding him his spinoff, it made sense for Frasier creators, David Angell, Peter Casey, and David Lee to pursue it. However, as much as I enjoy Frasier, I know that a big part of why the original show was so entertaining was because of Pierce’s Niles.
https://screenrant.com/frasier-reboot-niles-david-hyde-pierce-update-return-happen/