I'm staying away from macOS Tahoe for now. NetNewsWire has already announced that they will no longer support the earlier 6.x release that I use. I assume that means no bug fixes or back-porting of new features. Sad.
Don't be sad! NetNewsWire has been my newsreader for well over a decade, and I only consider "upgrading" out of idle curiosity, because the version I have now does what I want, and does it well. The version treadmill is a machine producing only sadness.
Vienna will support older MacOS releases for longer. Our development has been slow the past couple of years due to maintainers having big life changes. Things are about to pick up so keep an eye out!