I was surprised to see my Homebrew consider my macOS a Tier 2 for using the very latest macOS version and Xcode version… But I think it's because I don't have Xcode 27.0, which is presumably releasing tomorrow?
This is a bug, sorry. Working on it.
What is the impact of being tier 2?
I’ll update Xcode, but I will definitely not install macOS 27.0
You can download Xcode 27 RC now from https://developer.apple.com/download/applications/.