I‘ve been waiting for two or three days for you to list a bunch of times when Apple forced buyers of new MBPs to use the very first release of a new OS, and instead of providing such examples, you keep insisting that doing so is standard practice for Apple. This is getting tiresome.
But to answer your question, obviously, Apple shouldn’t start shipping new machines with Monterey until after the first or second update has been released, since this would make everyone happy. Buyers who want to update immediately can click the “update” button in Software Update, while those who want to use Big Sur until Monterey is more stable and/or compatible with third-party apps can do so.