They do all they can to force you to upgrade.Funny enough I’m on 17 and went to use the Apple support app yesterday. There’s a mandatory update that you have to be on 18 to download. So you can’t use the support app unless you’re on the latest version.
And the Apple Store app requires 17 and up, which is insane to me lol
I got refused support because I flat out didn't want to upgrade my M1 Studio from Sonoma which has been rock steady (I did upgrade to Sequoia and it was a horrible experience with lag etc so downgraded again).
Really think that if I'm forced or see nag screens to go to Tahoe then I'll look into other options to upgrade the Studio.
At the moment though I'm loving the machine and the UI of Sonoma. It's nice and clean, and legible and a perfect work machine.