so, you looked at the 'under the hood' changes, the code... and determined this? 🤔
If you look from a developer perspective then every yearly update is a major update, including point updates. If you look from a user perspective then some updates are minor and no rush to upgrade.
In Monterey’s case and from user perspective, out of about 20 apps and a couple of drivers I have I didn’t encounter anything broken yet. That’s the first time in a very long time this happened. Usually a new macOS has had so many changes that these same apps and drivers break and need to be updated.