I use my Mac for film scoring and music production, so I have a long-standing practice of keeping my operating system one major version behind for stability reasons. If you want to do the same and at the same time avoid those annoying Tahoe update notifications then simply enable beta updates for OS 15 in settings. I don’t imagine I’ll ever update to Tahoe because I dislike the UI so much but honestly OS 15 is rock solid and it looks great, I’d be very happy sticking with it until EOL for this machine.